The invention provides an anti-blocking impeller with a cutting edge. The anti-blocking impeller comprises a circular base, a plurality of leaves, cutting knives, end covers and springs, wherein the circular base with grooves is arranged on the circumference, the plurality of leaves are installed in the grooves through fastening screws, the cutting knives are installed in sliding grooves in the front side of the leaves through mounting frames, the end covers are arranged at the front ends of the leaves, and the springs are connected between the mounting frames and the base; a cover plate is hemispheric, threads are arranged on the inner side of the cover plate, and the threads are used for installing the cover plate on the base; the sliding grooves are T-shaped grooves, and sealing coversare arranged on the outer side of the sliding grooves; and a connecting seat for connecting a rotating shaft is arranged at the rear end of the base. According to the anti-blocking impeller with the cutting edge, the structure is simple, the cutting knives capable of moving are arranged on the leaves, and the cutting knives are stretched under the action of a centrifugal force; and under the action of the springs, the positions of the cutting knives are changed by changing the rotating speed, sundries on the leaves are removed, and blockage is prevented.