Water pump control method and device

According to the water pump control method and device, when the load of the engine is larger than or equal to the preset value, it can be considered that the engine is in a large-load state, the water outlet amount of the electronic water pump can be controlled with the first temperature as the target temperature of the cooling water outlet position, and when the load of the engine is smaller than the preset value, the water outlet amount is controlled. The engine can be considered to be in a small-load state, the water yield of the electronic water pump can be controlled by taking the second temperature as the target temperature at the cooling water outlet position, and the second temperature is higher than the first temperature, so that a relatively weak cooling effect can be provided for the engine in a small-load state, and a relatively strong cooling effect can be provided for the engine in a large-load state; and the problem of insufficient combustion caused by too low cylinder wall temperature under sm