Power system for driving power switching and stepless speed change of rack rail vehicle and rack rail vehicle

The invention discloses a power system for driving power switching and stepless speed change of a rack rail vehicle, the rack rail vehicle transmits driving force from a driving wheel assembly to a driven wheel assembly through a transmission belt, grooves which are formed in the radial direction and are adjustable in width are formed in the driving wheel assembly and the driven wheel assembly correspondingly, and the driving wheel assembly and the driven wheel assembly are connected with the rack rail vehicle through the transmission belt. The circumferential radius of the transmission belt on the driving wheel assembly and the driven wheel assembly is adjusted by adjusting the width of the groove, and continuous change of the transmission ratio is achieved. The driven wheel assembly is designed into an inner wheel and an outer wheel which can rotate independently, the inner wheel is fixedly connected with a steel wheel shaft, the outer wheel is fixedly connected with a rack rail gear, a transmission belt is