The invention discloses a hydrophilic modification method for a polytetrafluoroethylene microporous material. The hydrophilic modification method includes pretreating the polytetrafluoroethylene microporous material by solvents; impregnating the polytetrafluoroethylene microporous material in aqueous solution containing hydrophilic materials; and enabling the hydrophilic materials to be firmly wound on the surface of the impregnated polytetrafluoroethylene microporous material under the actions of cross-linking agents and catalysts so that hydrophilization of the polytetrafluoroethylene microporous material is realized. The hydrophilicity of the polytetrafluoroethylene microporous material is improved by the hydrophilic modification method. The water flux of the hydrophilicity-improved polytetrafluoroethylene microporous material is increased by 50-80% (under the test pressure of 0.1Mpa). The hydrophilic modification method is simple in process, low in cost and applicable to flat, hollow fibrous and tubular polytetrafluoroethylene microporous materials, and the modified polytetrafluoroethylene microporous material can be widely applied to the sewage treatment industry and has remarkable economical and social benefits.