The invention discloses a three-freedom-degree multi-station punching automatic feeding device, and belongs to the technical field of machine manufacturing equipment. The three-freedom-degree multi-station punching automatic feeding device can be applied to automatic feeding during small and medium size punching part multi-station machining. The device comprises a base, an air cylinder, guide columns, a supporting table, a transverse lead screw, a transverse drive motor, a transverse drive motor support, transverse bearing pedestal assemblies, transverse lead screw nut seats, a first transverse sliding rail, a second transverse sliding rail, a third transverse sliding rail, transverse movement sliding blocks, longitudinal sliding rail supporting rods, a longitudinal drive motor, a longitudinal drive motor support, a longitudinal lead screw, longitudinal bearing pedestal assemblies, longitudinal lead screw nut seat, a longitudinal lead screw supporting plate, guide sliding blocks, longitudinal sliding rails and clamps. According to the working principle of the device, the lead screws are driven by the motors to achieve transverse and longitudinal feed, and then the clamps are drivento complete clamping and conveying on workpieces; and the air cylinder is used for driving the supporting table to ascend and descend, the workpieces are separated from the station upwards, preparations are made for entering the next station, and then automatic feeding work is achieved.