The invention provides a power system for constructing an aircraft and the aircraft, and belongs to the field of aircrafts. The power system comprises a rotor mechanism, wherein the rotor mechanism comprises a rotatable rotating shaft and a propeller; the rotating shaft is connected with a rotating control mechanism; the rotating control mechanism comprises a control device and a transmission mechanism; the control device and the rotating shaft are connected through a transmission mechanism; the propeller and a driving device are rotationally connected; the driving device is fixedly connected with the rotating shaft. The power system can be used for constructing the aircraft capable of realizing vertical take-off and landing, hovering, high flight speed and long flight time.