The invention relates to a methanol gasoline complexing agent for vehicles and a preparation method of the methanol gasoline complexing agent. The methanol gasoline complexing agent is prepared from the following raw materials in percentage by mass: 4-5% of triethanolamine, 30-35% of liquid paraffin, 3-5% of tween-80, 3.5-6% of oleic acid, 25-28% of butyl alcohol, 12-14% of isoamyl alcohol, 5-8% of acetone, 1-5% of ethylene glycol monobutyl ether, 5-6% of kerosene and 6-10% of benzene. The preparation method comprises the following steps: 1, mixing liquid paraffin, triethanolamine and isoamyl alcohol according to the ratio of 6:5:1:2.4 to 8.75:7:1:3.5 for later use; 2, mixing tween-80, oleic acid and acetone according to the ratio of 1:0.7:1 to 1:2:2.67 for later use; 3, mixing ethylene glycol monobutyl ether and benzene according to the ratio of 1:1:1.2 to 1:6:10 for later use, and mixing the three mixtures, thereby obtaining a finished product. The raw materials needed in the methanol gasoline complexing agent are rich and easy to obtain, no 'three wastes' are generated, the methanol gasoline complexing agent is safe, environmentally friendly and simple in process, and the series of technical problems of a conventional high / low vehicle methanol gasoline finished product are effectively solved.