Supporting device of pre-embedded distribution box

The utility model belongs to the technical field of construction auxiliary equipment, and particularly discloses a supporting device of a pre-embedded distribution box, which comprises a Y-shaped connecting rod and two parallel square frames, connecting blocks are welded at two ends of the square frames, second sliding grooves are welded on the connecting blocks, second sliding blocks are connected in the second sliding grooves in a sliding manner, threaded through holes are formed in the second sliding grooves, and the threaded through holes are communicated with the Y-shaped connecting rod. The second sliding blocks are fixed through bolts penetrating through the threaded through holes, the two ends of the Y-shaped connecting rod are fixedly connected with the second sliding blocks, and the other end of the Y-shaped connecting rod is fixedly connected with a steel plate. When the supporting device is used, a constructor puts the supporting device into the distribution box, slides the first sliding block, dr