The invention relates to an electric excitation part double stator brushless mixed excitation synchronous generator. The generator is composed of a permanent magnet synchronous motor (17) and an electric excitation part (18), magnetic circuits of the two parts are mutually independently, and an armature winding (5) is arranged in a stator core (9) of the permanent magnet part and an outer stator core (12) of the electric excitation part. The electric excitation part is provided with the outer stator core (12) and an inner stator core (11), and a three phase or multiphase exciting winding (10)is placed in the inner stator core (11). Magnitude and phase of current in the exciting winding (10) are changed by virtue of a frequency converter, so as to regulate magnitude and phase of electric excitation electromotive force in the armature winding (5), thus achieving the aim of adjusting total electromotive force and output voltage. The electric excitation part has no air gap, and magnetomotive force required by electric excitation is small, thus field adjustment efficiency is high. The electric excitation magnetomotive force can not cause irreversible demagnetization on permanent magnet, and brushless alternating current excitation is adopted, thus reliability of motor is high.