The invention discloses a fixed-frequency air conditioner control method. The method comprises the steps of (1) acquiring a current indoor temperature and a current indoor coil pipe temperature during operating of an air conditioner, and comparing the current indoor temperature with a current set temperature; (2) comparing the current indoor coil pipe temperature with a current coil pipe target temperature if the comparison result of the current indoor temperature and the current set temperature meets the condition of operation stopping of a compressor at the indoor temperature; (3) determining the current coil pipe target temperature according to the current set temperature; (4) controlling the compressor to stop operating if the comparison result of the current indoor coil pipe temperature and the current coil pipe target temperature meets the condition of operation stopping of the compressor at the coil pipe temperature; and (5) otherwise, controlling the compressor to continue operating. By means of the fixed-frequency air conditioner control method, fluctuation of indoor temperature can be reduced by reducing the start-stop frequency of the compressor, and the comfort performance of the fixed-frequency air conditioner is improved.