Surge detection method and compression device

A surge detection method and a compression device are provided. The compression device has a compression motor, two pressure sensing modules, a current sensing module, and a control module. The two pressure sensing modules obtain a plurality of low voltage values and a plurality of high voltage values of the compression motor, respectively. The current sensing module obtains a plurality of motor current values of the compression motor. The control module has an arithmetic unit and a judgment unit. The arithmetic unit performs frequency domain analysis and normalization of the low voltage values, the high voltage values, and the motor current values so as to generate a plurality of low-pressure normalized values, a plurality of high-pressure normalized values, and a plurality of current normalized values. When the judging unit judges that the low-voltage normalized value, the high-voltage normalized value, and the current normalized value in the same time are both greater than a comparison value, the judging u