Pre-punching device for electrical switch bottom box

The utility model relates to a pre-punching device for an electrical switch bottom box. The device comprises a machine base, a mounting plate is horizontally arranged on the machine base, a first aircylinder is horizontally arranged on the mounting plate, a piston of the first air cylinder is connected with an electric heating punch, a first sliding groove is further formed in the mounting plate,a stop block is arranged in the first sliding groove in a sliding mode, and a positioning base is arranged between the first sliding groove and the electric heating punch; a motor located below the mounting plate is further arranged on the machine base, a rotating shaft of the motor extends upwards to be connected with a rotating rod, and the rotating rod is inserted into the mounting plate fromthe lower portion to be connected with a rotating assembly arranged in the mounting plate to drive the positioning base to rotate; and the stop block is also connected with a buffer assembly for assisting the positioning seat i