Power control method, controller, vehicle-mounted heating system and vehicle

The invention relates to the technical field of vehicle-mounted heating, and discloses a power control method, a controller, a vehicle-mounted heating system and a vehicle. The power control method comprises the steps that firstly, the temperature of cooling liquid of the vehicle-mounted heating system and the flow of the cooling liquid are obtained, and if the temperature is larger than or equal to a first temperature threshold value, the working mode of the heating power of the vehicle-mounted heating system is determined according to the flow, a first flow threshold value and a second flow threshold value, the working modes of the heating power comprise a full power mode, a limited power mode and a pause power mode, if the temperature is smaller than a first temperature threshold and larger than a second temperature threshold, the working mode of the heating power at the last moment continues to be maintained, and if the temperature is smaller than or equal to the second temperature threshold, the working