The invention provides a powdery material heating device and method. The powdery material heating device comprises a raw material conveying system and a fluidzed heating system, wherein the fluidzed heating system comprises n-level whirlwind heaters connected through a first pipeline, wherein n is larger than or equal to 1 and is a positive integer; in the n-level whirlwind heaters, an air inlet formed in a next-level whirlwind heater is communicated with a discharge opening in a previous-level whirlwind heater in the flowing direction of powdery material; an air outlet in the next-level whirlwind heater is communicated with an air inlet in the previous-level whirlwind heater; a high temperature air inlet is formed in a part, positioned between the air inlet in the n-level whirlwind heater and the discharge opening in the n-1 whirlwind heater, of the first pipeline; the raw material conveying system is connected with the part, positioned between the air inlet of the first level whirlwind heater and the air outlet of the second level whirlwind heater, of the first pipeline. The device and the method have the characteristics that the quick heating of the powdery material is achieved through using industrial exhaust gas afterheat, the heat transfer efficiency is high, and the material handling capacity is large.