This invention relates to a method for preparing leadless composite gasoline added with methanol and ethers. The leadless composite gasoline is composed of: methanol 50-80 parts, gasoline product 10-30 parts, naphtha 20-30 parts, isobutanol 0.5-14 parts, methyl-tert-butyl ether 1-8 parts, petroleum benzene 0.1-10 parts, petroleum ether 0.3-10 parts, additives 0.1-3 parts and assistant liquid 0.2-0.5 part. The additives are mixed from zinc peroxide, dimethyl carbonate, and vat yellow, cyclohexylamine and isooctyl nitrate. The assistant liquid is prepared from n-butanol, petroleum benzene and cyclohexylamine. The method comprises: (1) preparing the additives; (2) preparing the mother gasoline; (3) preparing modified methanol; (4) preparing modified naphtha; (5) preparing the synthetic liquid; (6) mixing with the assistant liquid to obtain leadless composite gasoline. The obtained leadless composite gasoline has high methanol content. |