The present invention provides a power source cold start control system and belongs to the new energy vehicle field. The system comprises a motor, an engine, a temperature acquisition module and a controller; and the fuel of the engine is methanol; the controller is configured to select the motor as a main power source to drive a hybrid vehicle when the temperature of a cooling medium is not higher than a minimum preset value, to select the motor as a main power source to drive the hybrid vehicle and control the engine to enter an idling state when the temperature of the cooling medium rises to a temperature not higher than an intermediate preset value, and to select the engine as a main power source to drive the hybrid vehicle when the temperature of the cooling medium rises to a temperature not higher than a maximum preset value. According to the power source cold start control system of the invention, based on the characteristics of the hybrid vehicle, a reasonable control strategy is adopted, and a cooling system is briefly improved, and therefore, the problems of difficulty in methanol vehicle start and high possibility of generating unconventional emissions can be solved, and the effective utilization rate of methanol fuel can be improved.