The invention relates to a vehicle-mounted windmill. A middle nose bridge, two vertical-shaft windmills and the like are used for forming a framework body with the middle nose bridge with one surface which has a convex angle, the framework body is similar to a nose of a human and the drag coefficient of a front face is reduced and is similar to the drag resistance of a bullet which is less than 0.3. During running, the two windmills transform power (most wind energy) which is consumed at the front face of a vehicle into torques in different directions, the torques respectively drive the rotor or the stator of a permanent magnet motor to double the speed (energy consumption during gear speed doubling is avoided), and when the running speed is larger than or equal to 36km/h, the generating capacity can meet the demands of normal load of the vehicle and the electricity consumed by an air blower supercharging system. An air blower presses a proper amount of air into an air cylinder with the rotation of en engine, the content of oxygen in a combustion chamber is improved and the engine is enabled to do work at a theoretical air-fuel ratio. With respect to the embodiment, the torque of the engine which is additionally provided with the vehicle-mounted windmill and the air blower supercharging system is 18-28 percent higher than the torque of a natural aspirated engine. Moreover, when a collision happens, a role of buffering and protecting passengers and drivers is played. The vehicle-mounted windmill invented by Chen Guowei has the advantages that the design is simple, the service life is long, the manufacturing cost is low, the operating cost is lower and the social popularization and application are facilitated.