The invention relates to an offset paper preparation method. The method comprises the steps that pulping is conducted with wood pulp, a sizing agent is added, filler is added, a retention agent is added, wet paper sheet papermaking is conducted, drying is conducted, and glaced finish is conducted to obtain paper. A quintuple retention system is used, in the step of adding the retention agent, polyacrylamide, bentonite and high polymer are cooperatively used, compared with the sizing agent weight, polyacrylamide is added first at the weight ratio being 3-8%, then 0.1-0.5% of bentonite is added,stirring is conducted, and finally 0.1-1% of high polymer is added, wherein the high polymer is prepared from polyacrylate, polymethacrylate, polycarboxymethyl acrylate at the ratio being 20-40%:30-40%:20-50%. The offset paper prepared on the basis of the quintuple retention system has the advantages of being high in strength, whiteness and smoothness and the like.