What is claimed is:1. A telecommunication cabinet, comprising:a cabinet body, comprising a cabinet and a telecommunication module disposed in the cabinet;a cabinet door module, comprising a cabinet door covering the cabinet body and a function module disposed in the cabinet door; anda detachable hinge, comprising a first shaft seat disposed on one side of the cabinet, a second shaft seat disposed on one side of the cabinet door and a pivot shaft;wherein, the cabinet door module is pivotally rotatable with respect to the cabinet through the pivot shaft inserted to the first shaft seat and the second shaft seat, and the cabinet door module is detachably coupled to the cabinet body,wherein a number of the detachable hinge is two, and two detachable hinges are spacedly disposed up and down on a same side of the cabinet and the cabinet door, andwherein the telecommunication cabinet further comprises a blocking screw disposed on an upper side of the second shaft seat located on a lower position so as to prevent the second shaft seat from being detached from the first shaft seat.2. The telecommunication cabinet according to claim 1, further comprising a pair of brackets connected to a rear side of the cabinet, and the telecommunications cabinet being attached through the pair of brackets.3. The telecommunication cabinet according to claim 1, wherein the cabinet comprises a convex plate disposed on a top of the cabinet, and the convex plate protrudes to top of the cabinet door module, and a gap is disposed between the convex plate and the cabinet door module.4. The telecommunication cabinet according to claim 1, wherein the detachable hinge further comprises a first supporting seat connected to the first shaft seat and a second supporting seat connected to the second shaft seat.5. The telecommunication cabinet according to claim 1, wherein the second shaft seat is stacked on the first shaft seat when the cabinet door module is coupled to the cabinet body.6. The telecommunication cabinet according to claim 5, wherein the first shaft seat comprises a first blind hole, and the second shaft seat comprises a second blind hole, and the pivot shaft is inserted in a shaft hole configured by the first blind hole and the second blind hole.7. The telecommunication cabinet according to claim 1, further including a pair of clasp locks spacedly disposed up and down on a same side of the cabinet and the cabinet door, and located on an opposite side of the detachable hinges.8. The telecommunication cabinet according to claim 1, wherein the function module comprises a heat exchange cooling module.