The invention claimed is:1. A device for coupling a communication equipment, to a communication pole, the device comprising:a plurality of fixing brackets;fastening grooves formed in the fixing brackets and coupled to connecting brackets;fixing grooves connected to the fastening grooves; andfixing assemblies disposed in the fixing grooves and including plate springs that protrude toward the fastening grooves or are inserted into the fixing grooves;wherein each of the plurality of fixing brackets comprises:a chain protrusion formed at one side of the fixing bracket in a width direction of the fixing bracket; anda chain groove formed at another side of the fixing bracket in the width direction of the fixing bracket,wherein the plurality of fixing brackets are coupled to each other in a chain shape by inserting the chain protrusion of one of said fixing brackets into the chain groove of a neighboring one of said fixing brackets such that the plurality of fixing brackets are coupled to each other to surround an outer circumferential surface of the communication pole.2. The device of claim 1, wherein the fastening groove includes:a first fastening groove recessed on a surface toward the other surface of the fixing bracket; anda second fastening groove formed in a width direction of the fixing bracket at an end facing an other surface of the first fastening groove.3. The device of claim 2, wherein the fixing groove is recessed in the width direction of the fixing bracket between a surface of the fixing bracket and the second fastening groove.4. The device of claim 3, wherein the fixing groove includes:a first fixing groove disposed relatively closer to an upper end of the fixing bracket than a lower end of the fixing bracket with respect to a length direction; anda second fixing groove located relatively lower than the first fixing groove with respect to the length direction of the fixing bracket.5. The device of claim 4, wherein the first fixing groove is open to a top of the fixing bracket.6. The device of claim 4, wherein the first fixing groove is recessed deeper than the second fixing groove to form a step, thereby further having a locking step formed at a joint between the first fixing groove and the second fixing groove.7. The device of claim 1, wherein the fixing assembly includes:a bolt having a thread and spaced a predetermined distance from a head; anda spring washer fitted on the bolt.8. The device of claim 7, wherein the plate spring has:an inserting portion having a hole to be able to be fitted on the bolt;a bending portion extending from the inserting portion and having a protrusion with a predetermined radius; anda fixing portion extending from the bending portion to protrude toward the fastening groove or to be inserted in the fixing groove.9. The device of claim 7, wherein the fixing assembly further includes a flat washer fitted on the bolt after the spring washer.10. The device of claim 8, wherein the fixing assembly further includes a snap ring configured to prevent the spring washer and the plate spring, which are fitted on the bolt, from being separated from the bolt.11. The device of claim 1, wherein chain holes are formed through the chain protrusion and the chain groove, and when the chain protrusion formed at any one fixing bracket is inserted in the chain groove formed at another fixing bracket, the positions of the chain holes are aligned.12. The device of claim 1, further comprising the connecting brackets disposed around outer surfaces of the fixing brackets and configured to be coupled to the communication equipment.13. The device of claim 12, wherein the connecting bracket has:a base having a surface coupled to the communication equipment; anda fastening protrusion formed on another surface of the base and inserted in the fastening groove of the fixing bracket.14. The device of claim 13, wherein the fastening protrusion includes:a first fastening protrusion formed in a length direction of the base and protruding perpendicularly from the other surface of the base; anda second fastening protrusion extending from an end of the first fastening protrusion in a width direction of the base.15. The device of claim 14, wherein the fastening protrusion further has an insertion groove recessed on a surface of a protruding portion of the first fastening protrusion.16. The device of claim 2, wherein the fixing groove is recessed on the second fastening groove toward the other surface of the fixing bracket.17. The device of claim 14, wherein the fastening protrusion further has an insertion groove recessed on a surface of the second fastening protrusion and formed on a surface that is opposite a surface connected to the first fastening protrusion.