The invention discloses an automatic cutting machine, which comprises: a workbench, a cutting knife, a clamping plate, a threaded rod, a driving mechanism, a hydraulic pump, a connecting rod and a telescopic rod. One chute and the second chute, the first chute and the second chute are respectively provided with a clamping plate, the work table is also provided with a knife groove, the cutting knife is arranged in the knife groove, and the clamping plate is formed with There is a clamping groove and a threaded rod on the clamping plate; the hydraulic pump is arranged on the upper surface of the workbench, one end of the connecting rod is connected to a clamping plate, the other end of the connecting rod is connected to another clamping plate, and the telescopic rod One end of the hydraulic pump is connected, and the other end is connected with the connecting rod. This automatic cutting machine overcomes the cutting machine in the prior art, the accuracy of plate cutting is poor, and the working efficiency of manual operation is low; a lot of noise will be generated in the process of processing, which seriously pollutes the working environment and affects the physical and mental health of workers health problems.