The invention discloses a mechanical manufacturing gripping device. The device comprises a fixed seat, a motor I, a movable cylinder, a transmission rod, a motor II, convex grooves, a nut seat, a clamping block, a vertical screw, a vertical guide groove, a vertical groove, an auxiliary gripping device, a driving gear I, a motor III, a driven gear I, a transverse screw I, a main gripping claw I, anend cover, a transverse guide groove I, a connecting gear I, a transmission end face gear, a connecting gear II, a transverse guide groove II, a transverse screw II, a main gripping claw II, a connecting end face gear, a motor IV and a driving gear II. The device has reasonable and simple structure, and the arranged auxiliary gripping device can effectively clamp common parts, thereby improving the gripping efficiency of the common parts; the transmission end face gear can effectively and synchronously transmit power of the transverse screw I to the transverse screw II for rotation, so that the main gripping claw I and the main gripping claw II can move outward or inward at the same time, and guarantee is also provided for centering and clamping of the parts.