the formula of alcohol-based fuel combustion improver consists of * * * solvent, bio-oil, smoke-eliminating combustion improver and cosolvent, and alcohol-based fuel is made by mixing and stirring methanol and alcohol-based fuel combustion improver. The prepared alcohol-based fuel is a new type of bio-environmental protection alcohol-based fuel, its calorific value is as high as 6111~11111 calories/g, and it has good combustion performance, and the alcohol-based fuel has high flash point and low volatility, thus eliminating the potential safety hazard in the prior art.. But also has the characteristics of safety, environmental protection, reproducibility, cleanliness, convenience in use, cheapness and the like.