Punching machine with die changing structure

The utility model provides a punching machine with a die changing structure. Comprising a bottom plate, clamping blocks are fixedly connected to the outer walls of four sliding blocks, and mounting columns are connected to the outer walls of the four clamping blocks in a clamped mode. According to the punching machine with the die changing structure, when a traditional punching machine with the die changing structure works, due to the fact that the functionalization of the device is not high, when different grinding tools of the traditional punching machine need to be replaced to machine different parts, the traditional punching machine is not high in practicability. A rotating rod arranged in the device drives a rotating ring to rotate, four push rods are rotatably connected to the outer wall of the rotating ring, limiting blocks are rotatably connected to the front ends of the four push rods, sliding blocks are fixedly connected to the outer walls of the four limiting blocks, and the sliding blocks are fixe