The invention discloses a flywheel which comprises a flywheel central body (1), a plurality of flywheel blades (2) and an outer ring (3), wherein each flywheel blade (2) is connected between the flywheel central body (1) and the outer ring (3); the number of the flywheel blades (2) is three; the included angle of adjacent included angles (2) is 120 degrees; a hanging hole (4) for hanging is formed in the flywheel central body (1); and a plurality of distributed grooves (5) are formed in the outer ring (3). The invention provides a flywheel which is provided with a hanging ring for hanging, and grooves are formed in the outer ring, so that the flywheel can be thrown by children conveniently with increased distance, is simple in structure, low in cost and unlikely to be lost or damaged, and has good application prospect.