The invention provides a method for removing environment hormone dimethyl phthalate in water body; the treated water is mainly used for water supplying in towns and cities and being stored in water plants; the method comprises the following steps: (1) flocculating agent-poly-dimethyl diallyl ammonium chloride is added in a reactor with source water, and the source water and the flocculating agentare completely stirred uniformly. (2) The source water treated in the step (1) is placed still for a while, and then the source water is discharged for subsequent treatment after carrying out flocculating settling. In the invention, the poly-dimethyl diallyl ammonium chloride is used as the flocculating agent to adsorb dimethyl phthalate in source water, and then the content of the dimethyl phthalate is effectively reduced through flocculating settling, so as to greatly improve the municipal engineering water supplying safety and hygienic quality. The method has the characteristics of convenient operation, low treating cost, easily-controlled conditions and stable treatment effect and can remove more than 60 percent of dimethyl phthalate organic matters in source water.