Expansion water tank electronic control pressure stabilizing system

The utility model provides an expansion water tank electronic control pressure stabilizing system which comprises an expansion water tank and a water tank cover clamped to a water adding opening in the expansion water tank in a covering mode. A pipe penetrating through the water tank cover is provided with a solenoid valve capable of controlling connection and disconnection between the expansion water tank and the atmosphere. An absolute-pressure pressure sensor is arranged above the interior of the expansion water tank. A signal output end of the absolute-pressure pressure sensor is connected with a signal collection terminal of an engine electronic control unit. The control end of the engine electronic control unit is connected with the solenoid valve. The solenoid valve and the engine electronic control unit are connected with corresponding working power sources. The pipe penetrating through the water tank cover is further provided with a pressure safety valve for controlling connection and disconnection between the expansion water tank and the atmosphere. The expansion water tank electronic control pressure stabilizing system has good safety, achieves precise control over the pressure of an engine cooling system, the stability of the pressure of the engine cooling system under different atmospheric pressure environments is guaranteed effectively, and meanwhile, the problems that an engine is easy to boil, and the heating load of parts is excessively high are avoided.