The invention discloses a pneumatic feeding drilling power head. The drilling power head comprises a motor, a cylinder and a drilling power head, wherein the motor serves as a power source; the cylinder is fixed with the motor by bolts and realizes pneumatic feeding; the drilling power head coaxial with the cylinder is arranged in the cylinder; a tip of the drilling power head is in pin connection with a motor rotating shaft; the cylinder comprises a front cylinder end cover, a rear cylinder end cover and a cylinder barrel; the cylinder barrel is in threaded connection with the front cylinderend cover and the rear cylinder end cover, and a cylinder piston and a hollow cylinder piston rod are sleeved in the cylinder barrel; the cylinder piston is in threaded connection with the cylinder piston rod; the drilling power head comprises a spline housing and a main shaft; the main shaft is embedded into the cylinder piston rod; and one end of the spline housing is in pin connection with themotor rotating shaft, and the other end of the spline housing is in sliding spline connection with the main shaft. In the pneumatic feeding drilling power head, all parts have high concentricity and are matched with one another in an axial length well.