When the cutter set needs to be installed, a movable sleeve is pressed downwards to enable a pressing part of a second groove to press a ball body steel ball on a first groove, and the whole cutter set is fixed to a motor rotating shaft. When the movable sleeve is pulled upwards to enable the accommodating part of the second groove to be horizontal to the ball body steel ball; The ball steel ballsfall into the containing part, at the moment, the ball steel balls are not pressed on the first groove any more, the middle shell, the movable sleeve and the stirring cutter set can be directly pulled out and separated from the rotating shaft of the motor, the whole cutter set is rapidly dismounted, the structural design is reasonable and simple, mounting and dismounting are easy, convenient andrapid, and cleaning of the cup body and the cutter set is facilitated.