The utility model discloses a fenestrate centrifugal impeller of blade trailing edge. Current centrifugal fan has increased the noise because the existence of secondary flow has reduced efficiency. The utility model discloses a punch combination has been seted up to the airfoil fan, and the punch combination includes 5-15 apertures of following airfoil fan afterbody edge equidistance and arranging, the center of aperture is 0.1-0.2 from the ratio of the distance at afterbody edge and the profound length of airfoil fan, the aperture is cylindrically, and the diameter is 0.05-0.2 with the ratio of impeller body width, the axis of aperture is 30-60 with the contained angle of the profound line of airfoil fan. The utility model discloses the department sets up the aperture that one row of equipartition was arranged at the airfoil fan trailing edge, can reduce the pressure differential of suction surface and pressure face to effectively reduce the secondary flow, increase the stability of air current in the runner, make gaseous boundary layer separation point move to the blade trailing edge, not only improved flow efficiency, also have fine inhibitory action to aerodynamic noise, make the pneumatic performance of whole of impeller greatly increase.