The present invention discloses a green synthesis method of glycerol carbonate, and the synthesis method is as follows: glycerin and urea as substrates are fully reacted at 140-160 DEG C in a neutral ionic liquid catalyst system, and a glycerol carbonate compound can be obtained by extraction and separation, purifying and drying of the obtained mixture. The synthesis method is simple and mild in reaction conditions, can replace a traditional method using a metal as a catalyst, uses the ionic liquid catalytic reaction system, is environment-friendly, good in repeatability, and green in ionic liquid production process, and has good atom economy.