The invention discloses an engine outer circulating cooling system which comprises a supercharger, an intercooler, an electronic control water pump and a cooling pipeline. The engine outer circulating cooling system further comprises a control system. The control system at least comprises a first detection unit for detecting the flameout signal of an engine, a processing unit for receiving the flameout signal and outputting a control instruction to a timing circuit, and the timing circuit for triggering timing and outputting a timing over signal to the processing unit after timing is over. The processing unit controls the electronic control water pump to stop working after receiving the timing over signal. When the engine is shut off, though circulation of oil stops, a cooling loop passing through the supercharger can still cool a turbine, and corrosion to the supercharger due to supercharger of cooling liquid is avoided; a car owner can stop a car without idling, troubles are omitted for the car owner, unnecessary fuel consumption caused during idling is also avoided, and the engine outer circulating cooling system saves more energy and is more environmentally friendly.