Alloy sheet cutting device

The utility model discloses an alloy sheet cutting device which comprises a cutting box, the inner bottom wall of the cutting box is fixedly connected with a forward and reverse motor, the output end of the forward and reverse motor is fixedly connected with a long threaded rod, and the other end of the long threaded rod is rotationally connected with the inner wall of the cutting box through a bearing. The outer surface of the long threaded rod is in threaded connection with a threaded lantern ring, the outer surface of the threaded lantern ring is fixedly connected with a long movable rod, and the top end of the long movable rod penetrates through the cutting box and extends to the position above the cutting box. According to the device, a first rack plate, a driven gear, a second rack plate and a second clamping plate are used in cooperation, a positive and negative motor is used for driving a threaded lantern ring to move, the first rack plate moves rightwards to be matched with the driven gear to drive t