Communication controller stable junction box of outdoor power distribution cabinet for transformer substation

The utility model relates to the technical field of power distribution cabinets, and particularly discloses a stable junction box for a communication controller of an external power distribution cabinet for a transformer substation, which comprises a junction box shell, and wiring equipment is arranged on the inner side wall of the junction box shell; the protection mechanism is arranged on the outer side wall of the junction box shell, the protection mechanism comprises a fixed outer plate, a connecting outer plate, a water collecting plate, a water leakage groove and a fixed top plate, and the fixed outer plate is fixedly connected to the outer side wall of the junction box shell; according to the utility model, water can be conveniently collected under the action of the water collecting plate and the connecting outer plate, and water flow can be guided through the water guide plate and the water outlet groove, so that the water flow passes through the water inlet groove and the heat dissipation groove to d