The utility model relates to an automatic shearing machine which is simple in structure and convenient for operation. A slideway is arranged in a workbench at the discharging direction, and a travel control switch is installed on the slideway and connected with a clutch control box and an electronic counter through cables. A solenoid is arranged in the clutch control box, and a magnet arranged above the solenoid is connected with a clutch control lever. After the size of a workpiece to be processed is set beforehand, and the travel control switch is set to the position corresponding to the preset size, a travel switch controls the solenoid to draw the magnet and the clutch control level to shear when the workpiece reaches the preset length and touches the travel switch, thereby greatly improving working efficiency and use convenience. On the other hand, the electronic counter monitors and sets shearing times. Manual operation is greatly reduced, and automatic production is realized.