The utility model belongs to the field of a washing machine, and particularly relates to a three-power washing machine. The three-washing machine comprises an outer barrel, an inner barrel arranged inside the outer barrel, a center impeller, a large impeller and a drive device. The center impeller and the large impeller are arranged on the bottom of the inner barrel and arranged coaxially with the inner barrel, and the drive device controls the inner barrel - the center impeller - the large impeller to rotate. The center impeller - the large impeller - the inner barrel simultaneously rotate back and forth in the direction of clockwise - anticlockwise - clockwise. The large impeller is in a disk-shaped structure which concaves downward from the circumference of an excircle toward the inside. The center of a disk is provided with a circular stage which is upheaved upward. The circular stage is provided with a through hole, the excircle circumference of the upper surface of the circular stage is provided with a circular ring which is convex upward, and the center impeller is placed on the circular stage inside the circular ring. The three-power washing machine has the advantages of being small in clothes abrasion, high in washing ratio, even in washing and the like.