The invention discloses a preparation method of a clean type fuel additive. The preparation method of the clean type fuel additive comprises the following steps of according to the parts by weight, putting 54 to 72 parts of dimethyl carbonate, 8 to 18 parts of polybutene amine, 2 to 10 parts of dioctyl adipate, 2 to 14 parts of peroxide tertiary butyl ether, and 14 to 29 parts of triethanolamine into a reaction kettle, uniformly stirring at room temperature, and obtaining a mixture I; heating the temperature in the reaction kettle to be 30 to 35 DEG C, adding 5 to 18 parts of ethyl nitrate, 1 to 8 parts of dinonylnaphthalenesulfonic acid sol, 4 to 13 parts of acetylacetone, 3 to 10 parts of polyvinyl butyral, and 7 to 14 parts of glycerol monostearate into the mixture I, carrying out ultrasonic sound, keeping warm, cooling to the room temperature, and obtaining a mixture II; settling the mixture II, filtering and filling to obtain the clean type fuel additive. The clean type fuel additive prepared by the invention achieves the effects of reducing deposit rate and improving fuel saving rate through components, and has favorable market application prospect.