A super-precision directly driving static pressure main shaft dynamic balance method relates to a static pressure main shaft dynamic balance method, which aims to solve the problem that the conventional method cannot realize the precise dynamic balance of a super-precision static pressure main shaft rotor. A conical mounting reference surface is processed at the rear end of the directly driving super-precision static pressure main shaft rotor; a standard ball is directly mounted on the conical reference surface and services as a measurement reference; the change of displacement of the standard ball and the high-precision displacement sensor is measured by adopting a high-precision displacement sensor when a main shaft is in rotation; the change is amplified into a 0-10 V signal via a sensor signal amplifier, which is input to a dynamic balancing instrument; information about the rotation speed of the main shaft, measured by a photoelectric velocimeter, is input into the dynamic balancing instrument; the measured information is processed by the dynamic balancing instrument to obtain the imbalance mass and the phase of the rotor; a required balancing weighting block is added on a dynamic balancing disc according to the indicated phase of the dynamic balancing instrument. The rotation center of the main shaft surely and well overlaps with the rotation center of a measurement reference ball, and influence of a mounting error on the measurement result is eliminated.