The invention relates to a cold and hot water level balancing method of a heat meter durability cold and hot impact test. The cold and hot water level balancing method of a heat meter durability coldand hot impact test includes the steps: collecting state parameters of a heat meter durability test process by taking a sampling period ts as the time interval; and establishing a test process state parameter data set, determining whether a hot water tank level data set Lhot of the step (2) is between the highest liquid level and the lowest liquid level of the hot water tank and whether a cold water tank liquid level data set Lcold is between the highest liquid level and the lowest liquid level of the cold water tank, and adjusting an inlet valve for the hot water tank, an outlet valve for thehot water tank, an inlet valve for the cold water tank and an outlet valve for the cold water tank to achieve the liquid level balance of the hot and cold water tank. The cold and hot water level balancing method of a heat meter durability cold and hot impact test effectively avoids the defect that one water tank overflows and one water tank is short of water due to the accumulative effect, and ensures the respective temperature stability of the hot and cold water tanks, so as to enable the test conditions of the platform to strictly follow the heat meter durability cold and hot impact test.