A multi head foot grinder includes a housing having a grip and a front frame at the front side of the grip, a rotary rack rotatably mounted on the front frame, a plurality of grinding heads mounted in the rotary rack, a driving device mounted in the housing, a transmission mechanism mounted on the front frame and the rotary rack and coupled to the driving device and the grinding head that is located at the front end of the front frame and drivable by the driving device to rotate the coupled grinding head, and a locking knob mounted on the front frame and movable between a locking position and a release position.
