The invention belongs to the technical field of control of cooling air quantity of refrigeration equipment and relates to a control method of cooling air quantity of an outdoor condenser. A control process comprises three parts including electric signal conversion, control of exhausting quantity of frequency conversion draught fans and control of air inlet quantity of an electric air valve, wherein condensation pressure is transmitted to a condensation pressure sensor from a condensation pressure capillary tube; the condensation pressure sensor is used for converting the condensation pressure to electric signals of voltage or current; a central PLC (Programmable Logic Controller) is used for outputting the signals to a draught fan frequency converter and an alternating-current contactor, respectively; the draught fan frequency converter is used for transmitting electric energy to the two frequency conversion draught fans according to the electric signals and controlling the working frequency and the rotary speed of the frequency conversion draught fans; an electric air valve controller is used for transmitting the electric energy to an electric performer of the electric air valve according to the electric signals and controlling forward and backward rotation and movement ratios of the electric performer of the electric air valve, so that linear control is realized; and the air inlet quantity can be automatically and linearly controlled, and the control method has the advantages of scientific control principle, simple and convenient process, high control precision, low energy consumption, long service life and reliability in controlling.