Electrical installation junction box for building outdoor engineering

The utility model discloses an electrical installation junction box for building outdoor engineering, which is used for solving the problems that the existing junction box is too many in components, complex in structure and inconvenient to disassemble and assemble. The junction box comprises an upper shell and a lower shell which can be buckled together, a tin belt penetrating hole and a cable penetrating hole are formed in the lower shell, a busbar and a diode are installed in the junction box, the busbar is directly fixed to the inner side of the lower shell through a screw, a cable penetrates through the cable penetrating hole and then is directly welded to the busbar, and the diode is connected with the busbar. A diode is welded between adjacent busbars, and a simple sealing device is arranged at the cable through hole. According to the utility model, the internal structure of the junction box is simplified to the greatest extent, components are greatly simplified, wiring requirements ...