Provided is an external rotor wind driven generator, which belongs to the technical field of new energy generating, and comprises a shaft, a turbine fan blade, a first armature winding, a second armature winding, a rotor iron core, a permanent magnet, a stator iron core, and a housing. The external rotor wind driven generator is characterized in that the inner side of the rotor iron core is provided with protruding rotor teeth in the number of 6k (k is a positive integer); the stator iron core fixed to the shaft is composed of U-shaped sub-stator iron cores in the number of 5k, and the two sides of the sub-stator iron core are respectively provided with a stator tooth protruding along the radial direction; a yoke part at the middle of the sub-stator iron core is embedded with the permanent magnet magnetizing along the axial direction; the root part of the stator tooth at one side of the sub-stator iron core is winded with the concentration type first armature winding , and the root part of the stator tooth at the other side of the sub-stator iron core is winded with the concentration type second armature winding. The invention is advantageous in that the rotor structure is simple and reliable, and the positioning force and the moment of inertia is small, and response is rapid; the demagnetizing armature reaction can be weakened, and the power density excitation and coiling mode can be improved, and thereby the external rotor wind driven generator is very suitable for the wind driven generator of gentle breeze.