The invention discloses energy-saving gasoline which is mainly prepared from the following components: gasoline, methanol, magnesium sulfate, naphtha, methylisothiazolinone, aliphatic ester, triethanolamine and polyisobutene imidodicarbonic diamide. The mixed gasoline disclosed by the invention is reasonable in formula, is capable of effectively improving quality of gasoline, improving combustionefficiency and increasing power and is remarkable in oil conservation effect. The mixed gasoline disclosed by the invention is simple in preparation process and the preparation process is easy to operate and handle.