Axial impactor

The invention belongs to the technical field of drilling equipment, and particularly relates to an axial impactor. The axial impactor comprises a shell, an impact assembly and an impact joint, the impact assembly periodically impacts the impact joint, the impact assembly comprises a sleeve assembly with an inner cavity, a liquid inlet is formed in one end of the sleeve assembly, a liquid outlet is formed in the other end of the sleeve assembly, and the liquid inlet and the liquid outlet are communicated through a flow channel; the piston assembly is arranged in an inner cavity of the sleeve assembly in an axial sliding mode and communicates with the flow channel, so that pressure in the flow channel can push the piston assembly to move upwards; the baffle is arranged in the sleeve assembly in a radial sliding mode, the baffle moves outwards in the radial direction after the piston assembly moves upwards, the flow channel communicating the liquid inlet with the piston assembly is blocked, and the baffle is res