Polyglycerol fatty acid ester and preparation process thereof

The invention discloses polyglycerol fatty acid ester and a preparation process thereof, and relates to the technical field of polyglycerol ester production. The polyglycerol fatty acid ester is prepared by the following steps: continuously polymerizing glycerol under the catalytic action of a base catalyst to generate polyglycerol, and continuously carrying out ester exchange on the polyglycerol and stearic acid under the catalytic action of the base catalyst to generate a polyglycerol fatty acid ester coarse material; and cooling and standing the polyglycerol fatty acid ester coarse material, spraying powder and conducting sieving, conducting metering and packaging, detecting metal, and conducting packaging and warehousing after the inspection is qualified to obtain a finished product. By arranging four polymerization kettles and two esterification kettles, polyglycerol generated by the polymerization reaction and stearic acid are introduced into a first esterification kettle, when the liquid level of the f