The invention discloses an engine cooling circulatory system and a control method thereof. The engine cooling circulatory system comprises a vehicle cooling module, a heater device, an engine water pump, a thermostat, an electronic water pump, an engine control unit and an exhaust gas recirculation system. The exhaust recirculation system comprises an exhaust gas recirculation (EGR)-cooler and a temperature sensor. The temperature sensor is used for measuring outlet gas temperature of the EGR-cooler. The electronic water pump is arranged in a water inlet pipeline of the EGR-cooler. The engine control unit is used for sending a control command to the electronic water pump according to the temperature detected by the temperature sensor. According to the engine cooling circulatory system and the control method thereof, whether the electronic water pump operates and the magnitude of the rotation speed are controlled through ECU, the problems that at part of operating points of an engine, water flow distributed by the EGR-cooler is insufficient, and consequently the EGR rate is limited are solved, thus all operating points of the engine can reach the best EGR rate, and fuel economy is further improved.