Engine cooling system and power device

An engine cooling system and a power plant, the engine cooling system comprises a water pump, an engine water jacket, an EGR cooler, an air heater and a cooling channel, the EGR cooler is used for cooling exhaust gas recirculated by an engine, the air heater is used for providing warm air for the engine, and the water pump, the engine water jacket, the EGR cooler and the air heater are communicated end to end through the cooling channel. The water pump is used for inputting cooling liquid into the cooling channel, so that the cooling liquid sequentially flows through the engine water jacket, the EGR cooler and the air heater and returns to the water pump to form circulation. The EGR cooler and the air heater are arranged, the cooling liquid sequentially flows through the engine water jacket, the EGR cooler and the air heater, the cooling liquid can be heated through the EGR cooler, and therefore the temperature of warm air of the air heater can be increased, warm air with the high temperature can be provided