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The shaft angle is an important parameter for rotating machinery, a new high precision digital micro-angle measuring system is proposed in this paper. The angle measurement system is proposed mainly by hall sensors, signal processing module and data processing module, angle signal is converted into two signals with phase difference by hall sensors; then these two signals are rectified through signal processing module, the pulses number in phase difference of two signal and cycle are obtained through high frequency pulses interpolation; finally, the pulses number are changed into the angle value by data processing module, and also be displayed. According to the experiments results, the accuracy of digital angle measuring system can reach 0.01°, the experiments results are analyzed.