The invention discloses a mixed excitation motor controller with a range extender control function, comprising a main control unit, an uncontrolled rectifier and an auxiliary circuit; the uncontrolledrectifier converts three-phase alternating current generated by a mixed excitation motor into direct current; the main control unit has functions of bus communication, motor control, analog signal sampling, digital signal input and output, and operational analysis; the auxiliary circuit has functions of filtering and protection. The mixed excitation motor disclosed by the invention is relativelylow in control cost and difficulty; the mixed excitation motor can change the air-gap magnetic field according to the exciting current, so as to change output current and output torque, not only can reduce the range extender control difficulty, but also can provide support for decoupling and independent control of the optimal working speed and torque in different working conditions. The mixed excitation motor controller has the functions of the mixed excitation motor and the range extender at the same time, and thus not only reducing the occupation area of the controller, but also reducing thehardware cost, and saving communication source of the range extender.