The invention discloses a gear tooth type powder metallurgy part surface extrusion machining die which comprises a cross beam, stand columns, a rack, supporting legs, an adjustable pipe, an adjustable bolt, an upper die, a die extrusion hydraulic rod, a lower die, a part body and a control panel, wherein the stand columns are connected to the left side and the right side of the lower portion of the cross beam through bolts; the longitudinal lower ends of the stand columns are in bolted connection with the middle parts of the left and right sides of the upper part of the rack; and supporting legs are connected to the four corners of the bottom of the rack through bolts. By arranging the movable clamping seat, the movable pipe, the supporting screw rod, the movable nut, the buffer spring, the movable clamping seat and the through hole, a part body is arranged between the movable clamping seat and the movable clamping seat, and then the movable nut is adjusted to move on the outer wall of the supporting screw rod, so that the movable clamping seat moves until the part body is clamped, and stable machining operation can be conducted, and the buffering stability is guaranteed through the buffering springs.