The invention provides a self-propelled power system comprising a power assembly and a self-propelled assembly, wherein the self-propelled assembly comprises a housing, an output mechanism and a centrifugal mechanism in engaged transmission with the output mechanism; the output mechanism comprises an output shaft and output gears fixed to the output shaft; the centrifugal mechanism comprises a centrifugal runner and rotating components arranged on at least one side of the centrifugal runner; the centrifugal runner is connected with at least one centrifugal block; the rotating components coverthe outsides of the centrifugal blocks and are connected with the centrifugal blocks to form separation and reunion structures; transmission parts are arranged at the sides, away from the centrifugalrunner, of the rotating components; the centrifugal runner is in engaged transmission with the power assembly; and the transmission parts are in engaged transmission with the output gears. The self-propelled power system of the invention has a larger rotational speed output range, facilitates quick adjustment of the output state of the self-propelled power system and improves the application rangeof the self-propelled power system.