The invention discloses a reaction kettle for high-temperature reaction, and belongs to the field of chemical engineering production. The reaction kettle for high-temperature reaction has the advantage that the molten salt is used for heating, so that the heating requirement of high-temperature reaction can be met, and the environment and safety problems due to open flame are solved. The reactionkettle comprises a casing of the reaction kettle, a molten salt heating half pipe, a molten salt inlet, a discharge valve, a stirring rod, a molten salt outlet, a liquid reaction matter inlet, and a solid reaction matter inlet, wherein the molten salt heating half pipe is welded at the outer surface of the casing of the reaction kettle; the molten salt heating half pipe at the bottom part of one side of the casing of the reaction kettle is provided with the molten salt inlet, and the molten salt heating half pipe at the upper part of the other side of the casing of the reaction kettle is provided with the molten salt outlet; both sides of the top end of the casing of the reaction kettle are respectively provided with the liquid reaction matter inlet and the solid reaction matter outlet; the stirring rod is arranged in the middle part of the interior of the casing of the reaction kettle; one part, extending out of the top end of the casing of the reaction kettle, of the top end of the stirring rod is connected with a motor, and the middle part of the bottom end of the casing of the reaction kettle is connected with the discharge valve.