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The invention provides a solid sodium lactate low-temperature granulation method. The method comprises the following steps: (1) a sodium lactate solution is subjected to reduced-pressure evaporation by using a thin-film evaporator, wherein sodium lactate content in the solution is increased to 90-92wt% within 5min; and the obtained solution is discharged. During the reduced-pressure evaporation process, the pressure of the jacket heating steam of the thin-film evaporator is controlled at 0.2-0.4MPa, the temperature in the thin-film evaporator is controlled at above 90 DEG C, and the pressure in the thin-film evaporator is controlled at 0.04-0.05MPa; (2) the concentrated solution is pressed into a rotating centrifugation spray granulation machine through compressed air, and the temperature of the concentrated solution is maintained at above 90 DEG C, such that the concentrated solution is spayed as a mist from a high-speed rotation disk on the upper part of the granulation machine; at a same time, cold air with a temperature of 4-15 DEG C is synchronously delivered from above the granulation machine, and the temperature of cold air delivered out from the lower side part of the granulation machine is no higher than 45 DEG C; liquid mist is subjected to heat-exchange with the cold air, and is cooled and solidified, such that sodium lactate solid crystallized powder is obtained. According to the invention, low-temperature granulation is adopted, such that production efficiency is high, and heat energy utilization rate is greatly improved. The method is suitable for popularization and production.