The invention discloses a detection method and device for a fault of a compressor. The detection method comprises steps as follows: the compressor is controlled to run by the aid of a control signal, and first reverse electromotive force of the compressor during running is obtained, wherein the control signal is used for controlling the compressor to run at a first revolving speed; on the basis of the first reverse electromotive force, whether the compressor has the jamming fault or not is judged. With the adoption of the detection method and device, the technical problem that whether inverter compressors have jamming faults cannot be accurately judged in the prior art is solved.