The invention is suitable for the technical field of cutting tools and particularly relates to a drilling and milling cutting tool capable of being applied to the field of metal base plate processing. The drilling and milling cutting tool comprises a blade radial part, wherein the blade radial part is provided with a main spiral groove, the main spiral groove comprises at least two right-handed spiral grooves, the head at the front end of the blade radial part is provided with two cutting teeth symmetrically arranged, the cutting teeth are provided with first and second face angles, the second face angles are larger than the first face angles, the front end of the blade radial part is provided with a first relief angle and a second relief angle, and the first relief angle is closer to the cutting edge relative to the second relief angle. The drilling and milling cutting tool provided by the invention improves blade keenness under the condition of ensuring blade thickness and chip discharging space and realizes drilling and milling processing. Through the design of the double relief angles, the integral strength of the cutting edge can be improved, friction can be reduced, and chip discharging space is increased. The blade radial part has high keenness under the condition of ensuring strength and rigidity. The processing performance is great.