Resistance-type molten salt heater capable of avoiding overtemperature risk and use method of resistance-type molten salt heater

The invention discloses a resistance-type molten salt heater capable of avoiding an overtemperature risk and a use method of the resistance-type molten salt heater. The resistance type fused salt heater comprises a shell, a mixed flow groove, a temperature adjusting pipeline and a plurality of temperature measuring elements, a plurality of electric heating pipes are inserted into the shell, and a fused salt outlet and a fused salt inlet are formed in the two ends of the shell respectively; the flow mixing groove is convexly formed in the position, close to the fused salt outlet, of the shell, and the flow mixing groove communicates with the interior of the shell; the outlet end of the temperature adjusting pipeline penetrates through the flow mixing groove and extends into the shell, the upper stream and the lower stream of the temperature adjusting pipeline are sequentially provided with a fused salt switch valve, a fused salt adjusting valve and a check valve, and the outlet end of the temperature adjusting