本发明一种三羟甲基丙烷三甲基丙烯酸酯的制备方法,包括以下步骤:(1)将主料三羟甲基丙烷和甲基丙烯酸放入酯化反应容器中,加入溶剂,加入催化剂,加入阻聚剂A,搅拌反应,得到反应物料;(2)控制酯化反应容器内的压力为-0.04~-0.08MPa,升高酯化反应容器内的温度至有回流液流出,保温,直至无回流液流出或直到检测到反应溶液中的酸值为 The present invention is a trimethylolpropane trimethacrylate preparation, comprising the steps of: (1) the main ingredient trimethylolpropane and methacrylic acid into the esterification reaction vessel, adding a solvent, adding a catalyst , Adding a polymerization inhibitor A, and stirring to obtain a reaction material; (2) controlling the pressure in the esterification reaction vessel to be -0.04 to -0.08 MPa, raising the temperature in the esterification reaction vessel to flowing out of the reaction liquid, Until no reflux liquid flows out or until the acid value in the reaction solution is detected