The invention discloses a heavy metal wastewater treatment agent, which includes olea europaea pomace, olea europaea sawdust, nitrohumic acid resin, dithiocarboxylated aminomethyl polyacrylamide, biochar, pyrrolidine dithiocarbamate chelated cellulose, starch xanthate, sodium dodecyl sulfonate, a cross-linking agent, sulfonated sulphur heterocarbon, 717 anion exchange resin, modified sericin, polyaspartic acid, beta-cyclodextrin, thiocarbazide, an accelerant, poly(diallylammonium chloride-acrylamide)yl sodium dithiocarbamate. Complexing, precipitation, coagulation, adsorption and other ways are adopted for synergistic coupling integrated treatment of heavy metal wastewater, the treatment agent has the characteristics of coarse flocculation, fast precipitation and strong trapping capacity,and can treat Cu<2+>, Cd<2+>, Hg<2+>, Pb<2+>, Mn<2+>, Ni<2+>, Zn<2+>, Cr<3+> and various heavy metals in wastewater, and also can remove part of COD ammonia nitrogen, phosphorus and Cr<6+>.