Mechanical automatic cut-off device

The utility model provides a mechanical automatic cut-off device which comprises a cutting table and an adjusting structure. Supporting columns are fixedly connected to the four corners of the top of the cutting table. The adjusting structure is arranged above the cutting table and comprises a fixing block, a first motor and a first screw rod, the bottom of the fixing block is fixedly connected with the top of the supporting column, one side of the fixing block is fixedly connected with the first motor, and the output end of the first motor is fixedly connected with the first screw rod; and the outer side of the first screw rod is rotationally connected with the inner wall of the fixing block, the outer side of the first screw rod is in threaded connection with a first sliding block, and one side of the first sliding block is fixedly connected with a second motor. The mechanical automatic cut-off device solves the problems that the cutting range of the device is limited and the working efficiency is low due t