The invention provides efficient engine-cleaning and power-increasing liquid as well as a preparation method and application thereof. The efficient engine-cleaning and power-increasing liquid is prepared from the following components in percentage by volume: 5 percent to 10 percent of methyl tert-butyl
ether, 10 percent to 20 percent of
dimethyl carbonate, 5 percent to 10 percent of
ethylene glycol monobutyl
ether, 5 percent to 10 percent of xylol, 10 percent to 20 percent of tert-butyl
alcohol, 5 percent to 10 percent of
isopropyl acetate, 5 percent to 10 percent of dilinoleic acid, 10 percent to 20 percent of polymethoxydimethyl
ether, 1 percent to 5 percent of
ethanolamine and 1 percent to 5 percent of ester
amide quaternary ammonium salt. By adopting the efficient engine-cleaning and power-increasing liquid provided by the invention, the utilization stability of
ethanol gasoline can be improved, deposited carbon is reduced, an engine is cleaned and
tail gas emission is reduced. Theefficient engine-cleaning and power-increasing liquid is also applicable to
gasoline for vehicles; the efficient engine-cleaning and power-increasing liquid is added according to the ratio on the basis of adding
national standard gasoline; meanwhile, the efficient engine-cleaning and power-increasing liquid has functions of enhancing vehicle power, improving the utilization stability of fuel, cleaning the engine and reducing the
tail gas emission.