The invention discloses an air conditioner automatic oil return control method and device. The air conditioner automatic oil return control method comprises the steps that the oil pressure of a compressor, the running power of an air conditioner, the running energy efficiency of the air conditioner and operating parameters of the exhaust temperature of the compressor during running of the air conditioner are obtained; the situation that whether the air conditioner is in an oil-deficient running state or not is judged according to the obtained operating parameters; and when the situation that the air conditioner is in the oil-deficient running state is judged, and the air conditioner is controlled to enter into an oil return control mode so as to control the air conditioner to conduct oil return. The air conditioner automatic oil return control method and device solve the problem that an oil-deficient judgment mode of an air conditioner unit in the prior art is not accurate enough, andaccuracy of oil-deficient judgment of the air conditioner unit and reliability of unit running are improved.