A method for preparing glyceride carbonate by using a loop reaction device comprises the following steps: adding glycerin, dimethyl carbonate and an alkali catalyst into a loop reactor, starting a loop circulating pump, pumping out the materials from the bottom of the loop reactor into an outer circulating heat exchanger so as to raise the temperature of the materials, ejecting the materials into the loop reactor by using an ejector so as to circulate the materials, and reacting the materials; emitting methanol steam and dimethyl carbonate steam which are generated in the reaction together with nitrogen from the upper part of the loop reactor into a separating tower, wherein the dimethyl carbonate is condensed, and reflows from the bottom of the separating tower into the loop reactor, the methanol and the nitrogen flow out from the top of the separating tower into a methanol gas phase condenser so as to condense the methanol, and a small amount of uncondensed methanol, dimethyl carbonate and nitrogen is pumped into the loop reactor by the ejector of the loop reactor for further reaction; and after the reaction, evaporating out excessive dimethyl carbonate gas from the upper part of the loop reactor, enabling the dimethyl carbonate gas to enter a dimethyl carbonate gas phase condenser to be condensed and collected, and obtaining the glyceride carbonate from the loop reactor. The method has the advantages of no pollution and high mass and heat transfer efficiency.