Abstract: There is more powerful background noise and lower signal-noise ratio in mine motor and it is difficult to diagnose equipment fault signal. In order to solve the problem, the method of correlation differential resonator array for mine motor equipment fault diagnosis was proposed. According to applying this method to detect the vibration signal of mine motor axle stretch end, the result showed that correlation analysis could remove the background noise in vibration signal of mine motor axle stretch end and improve the signal-noise ratio. The differential resonator array could detect the motor signal with different frequencies and be accurately diagnosed the hidden faults in mine motor. Correlation differential resonator array was a new fault diagnosis method for mine motor.