The invention discloses an epicycloid centrifugal pump impeller. The epicycloid centrifugal pump impeller comprises a wheel disc and blades which are fixedly arranged on one end face of the wheel disc. The tail sections of the blades are gradually changed to be of an epicycloid structure which extends in the radial direction of the wheel disc. According to the epicycloid centrifugal pump impeller, molded lines on the tail sections of the blades are epicycloids close to the fluid motion law, the impeller is designed to be in a half-open type, compared with a common centrifugal pump, loss at an outlet of the impeller can be reduced, the partial reflux phenomenon is reduced, and water pumping efficiency is improved.