The invention discloses a low-cost polished tile antifoulant. The low-cost polished tile antifoulant comprises, by mass, 2-8% of stearic acid, 3-12% of paraffin, 60-90% of solvent and 10-30% of anhydrous alcohol. A preparation method of the low-cost polished tile antifoulant includes blending the stearic acid, the paraffin, the solvent and the anhydrous alcohol into an adjustable dehydrator according to the ratios, stirring for 15-25 minutes at normal temperature, filtering after solid substances dissolve completely, and packaging. The low-cost polished tile antifoulant has the advantages of low cost, good antifouling effect and convenience in use.