The invention discloses a one-way clutch which comprises a reduction gear and a star wheel, wherein the star wheel is arranged in an inner hole in the reduction gear; an output shaft is mounted in the center of the star wheel; a plurality of accommodating grooves are formed in the outer edge of the star wheel circumferentially at intervals; a plurality of grooves matched with the accommodating grooves are formed in the inner wall of the reduction gear; elastic elements are arranged in the accommodating grooves; rollers are compressed in the grooves by the elastic elements; a guiding inclined plane in the rotation direction of the reduction gear is arranged on one side of each groove. The one-way clutch is not only simple in structure, but also easy to machine, produce and assemble, and safe and reliable in operation.