The invention discloses a method and device for starting the blower of anoutdoor unit of an air conditioner. The method comprises the following steps: a positioning current is fed in the blower through an inverter, so as to enable the blower to be positioned in a first position; when the blower is positioned in the first position, the first current of the first phase of the inverter and the input voltage of the inverter are obtained; the stator resistance of the blower is obtained through calculationof the first current of the first phase of the inverter and the input voltage of the inverter; thestarting parameters of the blower are determined according to the stator resistance of the blower; the blower is started by using thestarting parameters. According to the method and device provided by the invention, that accurate startingparameters are determined under various working conditions is realized, so that the blower of the outdoor unit of the air conditioner can be started smoothly, therefore, that the blower, driven by the positionsensor-less, of the outdoor unit of the air conditioner can be started smoothly under various working conditions is realized, and the reliability of the blower starting is ensured.