The utility model relates to a wiring cabinet, especially a before advancing, side goes out to concentrate wiring cabinet for prefabricating cabin in the prefabricated cabin, including the cabinet body with exempt from the butt fusion distribution case, the cabinet body including preceding cabinet door with install the inboard pigtail cable trough of cabinet door in the front, its structural feature lies in, the cabinet body is still including the other side cabinet door that is located cabinet sinistron side or right side and install the optical cable trough in other side cabinet door inboard, exempting from the butt fusion distribution case and being the distribution case that goes out before a side is advanced, should exempt from the butt fusion distribution case has fiber cable joint corresponding to other side cabinet door's side areal distribution, and has pigtail cable to connect corresponding to the positive areal distribution of preceding cabinet door. The utility model has the advantages of: the inlet wire effectively separates on the space with being qualified for the next round of competitions, and the high efficiency construction is realized to each other noninterference, avoid overlapping, the wiring is clear simple, and construction maintenance is convenient, has avoided the optical cable to break pigtail cable's wiring risk, provide sufficient space for away theline, also go on more easily during the distant view construction and do not influence the wiring in earlier stage.