The invention discloses an automatic discharging device for a cold-punching mould and a use method thereof. The device comprises a stripping mechanism, a jacking mechanism and an unloading mechanism;a to-be-processed workpiece is put on a mould core, then a pressure machine exerts deformation force on an upper mould, a pressure sensor on the mould core detects pressure strength, a control systemcontrols an electromagnetic induction switch to control a telescopic rod to retract, a fixing block descends into a retraction interval, and the mould core is separated from the workpiece; when the stripping mechanism separates the mould core from the workpiece, the control system controls a compression air pump to introduce compressed air into an air drain, the compressed air is introduced into an interval between the workpiece and the mould core through a jacking hole, so that the mould core is further separated from the workpiece; a displacement sensor detects a displacement position of theworkpiece, when the workpiece moves to be completely separated from a mould, the control system controls a driving motor to drive a pushing plate to push the workpiece forward onto an unloading platform, parallel conveying rails are arranged on the unloading platform, and the molded workpiece is conveyed to the next processing station.