The invention discloses a control method, device and system for electric heating equipment. The method includes the steps that control information sent by transformer terminal equipment is received, wherein the control information includes a control command and a control priority; whether the control priority is the highest priority or not is judged; and under the condition that the control priority is the highest priority, the running state of the electric heating equipment is controlled according to the control command, wherein the running state at least comprises any one of the stating state, the stopping state and the energy storage state. By means of the control method, device and system, the technical problem that electric heating equipment in the prior art can be connected into a power grid at any time, and impact on the power grid is caused, and consequently the capacity of the power grid is insufficient is solved.