The invention discloses a magnetic centrifugal clutch which comprises an output hub, two centrifugal blocks, magnets, an input shaft sleeve and a friction material. The input shaft sleeve is arranged at the rotating center of the output hub, the input shaft sleeve and the output hub rotate coaxially, the centrifugal block are arranged on the input shaft sleeve in a sliding rotation-stopping fit manner, the magnets are arranged between the input shaft sleeve and the centrifugal blocks, and the friction material for increasing the friction coefficient is arranged on the outer walls of the centrifugal blocks. The magnetic centrifugal clutch is pretightened on the input shaft sleeve by using magnet attraction force rather than spring tensile force, not too large centrifugal force is needed for overcoming the magnet attraction force as long as the combination rotating speed is obtained, and the energy-saving effect is very obvious. As the magnetic centrifugal clutch is not provided with a spring, many products such as high oil consumption, clutch heating and easy damage caused by critical rotating speed combination of a traditional centrifugal clutch are solved, and the beneficial effects of being good in energy-saving effect and not prone to being damaged are achieved.