本发明提供了一种非极性溶剂合成高纯度三甲基铝的方法。该方法以甲基倍半铝（C3H9Al2X3，X为Cl、Br或I）为原料，与卤甲烷的格氏试剂在不含氧的非极性的惰性溶剂里反应制备高纯度三甲基铝，将格氏试剂的含氧极性溶剂用不含氧的非极性溶剂替代，在反应过程中不存在三甲基铝与醚类化合物的的络合物，使得三甲基铝的收率和纯度提高。

 The invention provides a method for synthesizing high-purity trimethylaluminum by using a non-polar solvent. According to the method, methyl sesquialuminum (C3H9Al2X3, wherein X is Cl, Br or I) is used as a raw material and reacts with a Grignard reagent of halomethane in an oxygen-free non-polar inert solvent to prepare high-purity trimethylaluminum, an oxygen-containing polar solvent of the Grignard reagent is replaced with the oxygen-free non-polar solvent, and a complex of trimethylaluminum and ether compounds does not exist in the reaction process, so the yield and the purity of the trimethylaluminum are improved.