Pre-embedded switch box device for precast beam pedestal

The utility model relates to a pre-embedded switch box device for a precast beam pedestal, which comprises a switch box, a protective layer and a support block, the protective layer is of a double-layer structure, a cushion block is arranged in the protective layer, the switch box is nested in the inner layer of the protective layer in a matched manner, and air holes are formed in the outer side end face of the protective layer; the supporting blocks are fixed to the bottom of the outer side of the protective layer at intervals, a channel is formed between every two adjacent supporting blocks, the inner end of each channel is closed and is of a structure with the open outer end, the supporting blocks are located on the ground in a supporting mode, and concrete is poured on the outer side of the protective layer to form the precast beam pedestal. According to the prefabricated beam pedestal, the switch box can be reserved in the prefabricated beam pedestal, the structure is moistureproof, heat dissipation is b