The invention relates to the field of home appliances, and specifically, to power control method, device, and system for enhancing power control of home appliances, thereby reducing peak power demand. The method comprises: obtaining a total used power in a controlled area; and if the total used power in the controlled area exceeds a power limit of the controlled area, transmitting, to at least one power-adjustable home appliance in the controlled area, a control parameter of the home appliance; wherein the control parameter is a power consumption limit or is used to obtain the power consumption limit.