Flocculant for treating oily sewage

The invention provides a flocculant for treating oily sewage, and particularly relates to the field of flocculants. The flocculant comprises the following substances by mass: 10%-50% of a dimethyl diallyl ammonium chloride homopolymer, and 50%-90% of a dimethyl diallyl ammonium chloride and acrylamide copolymer. A production process comprises the following specific steps: S1, mixing dimethyl diallyl ammonium chloride with water, introducing nitrogen for protection, and adding an initiator under a water bath condition of 25-90 DEG C for reaction to obtain a product 1, and S2, mixing dimethyl diallyl ammonium chloride, acrylamide and water, introducing nitrogen for protection, adding an initiator under a water bath condition of 25-75 DEG C for reaction, adding the product 1 after the reaction is finished, and fully mixing and stirring to obtain the product after the reaction is finished. The method is simple in production process, has a good effect on oily sewage treatment, and can effectively reduce the oil co