Petroleum sewage treatment agent and preparation method thereof

The invention relates to the field of sewage treatment, in particular to a petroleum sewage treatment agent and a preparation method thereof.The petroleum sewage treatment agent is obtained by sequentially grafting an alkenylation magnetic carrier through a chain anionic polymer and a branched amino polymer and then conducting amination, wherein the internal chain anionic polymer expands after absorbing water, so that the chain segment grafted branched amino polymer can be more expanded, the petroleum sewage treatment agent can be in full contact with petroleum sewage, and in addition, the internal anionic polymer can also adsorb cations in the petroleum sewage, so that the petroleum sewage treatment agent can be used for treating the petroleum sewage. According to the petroleum sewage treatment agent disclosed by the invention, the oil removal rate and the suspended matter removal rate of the petroleum sewage treatment agent are further improved, and particularly, the oil removal rate and the suspended matte