The invention relates to a punching device, in particular to a board punching device. the board punching device is high in punching speed, and an operator is not prone to being hurt. The board punching device comprises a hollow bottom plate, supporting legs, first sliding blocks, a containing plate, a 7-shaped plate and the like; the supporting legs are arranged at the four corners of the bottom of the hollow bottom plate, sliding grooves are formed in the left and the right of the top of the hollow bottom plate, the first sliding blocks are arranged in the sliding grooves in a sliding manner,the containing plate is arranged on the tops of the first sliding blocks, an opening is formed in the containing plate, the 7-shaped plate is arranged on the right of the hollow bottom plate, and a left and right moving device is arranged on the top inside the 7-shaped plate. Through the left and right moving device, the position of the punching device is adjusted, through the punching device, the board is punched, a fixing device is arranged, and therefore when the board is punched, the board is more stable, and the effects that the punching speed is high, and the operator is not prone to being hurt are achieved.