The utility model discloses a brushless direct current motor controller which includes a tube, a DBC substrate arranged in the tube, and a control circuit. The control circuit includes a reversing logic circuit and a three-phase power bridge circuit, wherein the inside of the reversing logic circuit is provided with three waveform signal input terminals, one rotation direction control signal input terminal, and six pulse signal output terminals, and the inside of the three-phase power bridge circuit is provided with six pulse signal input terminals and three control signal output terminals. The beneficial effects are that the volume of the controller is reduced, the weight is reduced, and the operation is simple; the performance of a spacecraft is improved; the brushless direct current motor controller can be widely applied to various spacecrafts, such as the missile, the satellite, the airship, and so on, and the reliability of a related servo system or a mechanical executing mechanism can be improved, and the service lifetime is prolonged; the reliability is improved, the service lifetime is long, and the radiation resistance is strong, the brushless direct current motor controller has the important meaning and the practical value to the performance improvement of the spacecraft.