NOVELTY - A heat transfer-heat storage medium comprises binary nitrate molten salt system and water glass composite in which binary nitrate molten salt system comprises potassium nitrate and sodium nitrate.    USE - A heat transfer-heat storage medium for industrial energy storage and solar energy photoelectric heating (all claimed).    ADVANTAGE - Heat transfer-heat storage medium is energy-saving and environment-friendly, improves safe operating temperature limit of system and has wide temperature range, good thermal stability, heat absorption, and heat storage ability, and fine and uniform final product.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of heat transfer-heat storage medium which involves adding binary nitrate molten salt system raw material to molten salt tank with interlayer, starting heat source device, heating to molten state, adding water glass, heating and stirring until homogenous, pumping to jet-milling dryer, jet-milling and drying, granulating, cooling, and discharging through output device in which heat transfer-heat storage medium preparation device comprises heat source device, molten salt tank with interlayer, jet-milling dryer, granulating device, cooling device, and output device, heat source device comprises heat-carrier bearing cavity, heat carrier pipe connects heat-carrier bearing cavity with interlayer cavity, molten salt tank, jet-milling dryer, granulating device, cooling device, and output device are connected by molten salt pipeline, molten salt pipeline extends through lower part of interlayer cavity and enters upper part of jet-milling dryer, lower part of jet-milling dryer is connected with heat exchanger, heat source device is solar collector system and/or portable electric heating, heat carrier pipe is set between solar collector system and molten salt tank and is provided with high-temperature storage tank, heat carrier pump is set between high-temperature storage tank and molten salt tank with interlayer, molten salt pipeline between molten salt tank with interlayer and jet-milling dryer contains molten salt pump, bottom of interlayer cavity is connected to heat exchanger by heat carrier pipe, heat exchanger is connected to heat source device by heat carrier pipe set with low-temperature storage tank, heat carrier pipe on both ends of low-temperature storage tank is set with heat carrier pump, molten salt tank contains stirring device and feed inlet, and output device contains silo, packaging device, and storage device.