Liquid level following type fused salt heating device for fused salt storage tank and using method of liquid level following type fused salt heating device

The invention discloses a liquid level following type fused salt heating device for a fused salt storage tank and a using method. The heating device comprises a floating plate, a liquid level meter and a plurality of electric heaters, each electric heater comprises an electric heating pipe, a supporting plate and a junction box, the electric heating pipes penetrate through the supporting plates and then are connected with the junction boxes, and the length of a cable extending into the fused salt storage tank is adjustable; the supporting plate is fixedly connected with the floating plate so that the electric heater can be fixed to the floating plate, and the floating plate is arranged above the liquid level of the fused salt storage tank through buoyancy. The liquidometer is arranged at the top of the fused salt storage tank, and the length of the cable extending into the fused salt storage tank is adjusted according to the reading of the liquidometer. The electric heater is integrally arranged in the fused