The invention discloses a multi-information-fused real-time wind speed estimation method for a multi-rotor aircraft. The method comprises that data of an airborne sensor and rotating speed data of rotors are collected; a dynamic model of the multi-rotor aircraft is constructed, and a relation between resistance and wind speed of the multi-rotor aircraft is obtained; a state equation and a measurement equation of a multi-information-fused navigation system based on characteristics of the dynamic model of the multi-rotor aircraft, inertia sensor information and GPS information are established; and navigation information is updated via Kalman filtering, and the wind speed is estimated in real time. According to the invention, disadvantages of present wind speed estimation methods are overcome, the characteristic that the dynamic resistance of the dynamic model is sensitive to the wind speed is utilized fully, a Kalman filter is constructed on the basis of an inertia device and GPS, and the wind speed is estimated accurately in real time.