The invention provides a high-precision direct current brushless servo motor driver, and relates to the field of motors. The driver comprises a rotational angle position sensor digital analysis precision commutation module, a CPLD I/O interface logic processing module, an MCU signal acquisition and algorithm control module, a signal conditioning and PWM pulse width control circuit, an auxiliary power supply and a high-voltage H-bridge COMS tube drive module. According to the invention, the driver is suitable for the control fields of automobiles, ships, packaging and printing, numerical control transformation, industrial automation and the like; electronic commutation, speed and position signals required by a controller are acquired through an angle position sensor; the sensor is used withthe high-precision direct current brushless servo motor driver to form a closed-loop motor speed control system; the frequency and pulse number of a step pulse signal are controlled; and precise speed control and positioning of a motor can be realized.