Combined energy-saving evaporator

The utility model discloses a combined energy-saving evaporator which is characterized in that an evaporation cavity comprises an upper evaporation cavity and a lower evaporation cavity which is connected with the upper evaporation cavity through a flange and is positioned at the bottom of the upper evaporation cavity; the upper end of the upper evaporation cavity is also connected with a cold trap through a flange; and a circulating water condensation pipe is arranged on the lower evaporation cavity. The utility model combines the advantages of a film evaporator and a short-path evaporator, can efficiently and quickly remove free glycerol and low-carbon-chain fatty acid ester, improves the product quality, reduces the original five-stage distillation separation product procedure to only three-stage distillation separation, reduces the production cost, and improves the production efficiency. And the quality of the prepared product exceeds that of the product of the molecular distillation glycerin monostearate