The invention discloses a method for detecting exhaust faults of a compressor, the compressor and an air conditioner. The method comprises the steps that after the compressor meets the startup condition to be started, a shield temperature wrap detects the open-circuit fault of exhaust temperature within set time; and when the compressor is in the startup state, the shield temperature wrap detectsthe open-circuit fault and the short-circuit fault of the exhaust temperature. The method is used for correcting detection of the exhaust temperature of the compressor, compressor frequent starting and stopping caused by erroneous judgment are reduced, and the service life of a unit is prolonged.