Please further refer to FIG. 4 to FIG. 6, which depict the perspective exploded views of the cabinet door and the fan module of this disclosure and a perspective exploded view of the fan module of this disclosure. With referring to FIG. 4 and FIG. 5, the cabinet door 20 includes an inner side 201 adjacent to the cabinet 11 and an outer side 202 located oppositely (i.e., the outer side 202 is located opposite to the inner side 201). The cabinet door 20 includes a plurality of coupling holes 203 disposed on the inner side 201 and a snap hole 204 disposed on the outer side. In addition, a bottom side of the cabinet door 20 is provided with an installation opening 200. It is worth noting that in this embodiment, the inner wall of the cabinet door 20 is provided with a plurality of sustaining plates 22. The coupling holes 203 are disposed on the sustaining plate 22 on the inner side 201 of the cabinet door 20, and the snap hole 204 is disposed on the sustaining plate 22 on the outer side 202 of the cabinet door 20. Therefore, the snap hole 204 may not be seen from the outside of the cabinet door 20, so as to enhance the overall aesthetics of the telecommunication cabinet 1.