The invention discloses an alcohol-based fuel combustion accelerant, which comprises the following components in parts by weight: 80-90 parts of co-solvent, 20-30 parts of solvent oil, 1.5-5 parts of smoke-eliminating combustion accelerant and 3.5-10 parts of co-solvent; The co-solvent is at least one of butanol, octanol, hydrogenated anthracene oil and light oil; the solvent oil is at least one of pine nut oil, turpentine oil, turpentine and glycerin. The combustion aid can form an ideal mixed liquid with methanol, improve the flash point and calorific value of the overall fuel, and promote the remarkable improvement of the final combustion efficiency of the alcohol-based fuel. The alcohol-based fuel combustion accelerant has a wide range of raw materials, is clean and environmentally friendly, and can be industrially mass-produced. The invention also discloses an alcohol-based fuel prepared by mixing 20-40 parts of the above-mentioned alcohol-based fuel combustion accelerant and 60-80 parts of methanol. By reducing the content of methanol, each component in the alcohol-based fuel forms an ideal mixed liquid, The added combustion aid components increase the overall calorific value and flash point, high fuel combustion efficiency, and less safety pollution.