A power supply system installed on a rotating object includes: a power generation device, and a power management device for converting the electric power output by the power generation device to adapt to load requirements, in which the power generation device includes a rotor installed on and fixed to the rotating object, the rotor including at least one induction coil, and a stator which is rotatable relative to the rotor, the stator including at least two magnetic poles; the stator includes a stator case and a counterweight block, and the stator case surrounds the rotor from the circumferential direction of the rotor, and is closed in the circumferential direction; and the counterweight block is fixedly arranged at one side of the stator case, and the angle of the counterweight block in the circumferential direction is in the range of less than or equal to 180 degrees.