The invention discloses a material heating device. The material heating device comprises a rotary kiln, a plurality of heat exchange tubes, a hot air shield, a high-temperature gas input mechanism, a waste gas collection chamber and a waste gas output pipeline, wherein the rotary kiln is provided with a feeding end a discharging end; the heat exchange tubes are arranged in the rotary kiln; the hot air shield is arranged outside a rotary kiln body; gas inlet ends of the heat exchange tubes are communicated with the hot air shield; gas outlet ends of the heat exchange tubes are communicated with the waste gas collection chamber; the waste gas collection chamber is communicated with the waste gas output pipeline; the hot air shield is communicated with the high-temperature gas input mechanism; a cavity between the heat exchange tubes and a heat insulation and heat preservation layer of the rotary kiln is a material channel; the heat exchange tubes are in direct contact with a material; most of the heat is directly transferred to the material through conduction and radiation; the loss of the heat is low; meanwhile, the waste gas after heat exchange is not in contact with the coal gas generated by pyrolysis; the generated coal gas is high in cleanliness, high in heat value and high in utilization value.