The invention discloses a heavy metal sewage treatment method based on magnetic ferroferric oxide nano-particles, and belongs to the technical field of sewage treatment. The method comprises the specific steps that dibutyl ammonium dithiophosphate is added into heavy metal sewage, and standing is performed after stirring is performed; then, after standing is performed, a clear solution is filtered, zeolite is added, microwave oscillation is performed under the room temperature, and secondary standing is performed; glucose, lecithin, sodium oleate, kieselguhr and absolute ethyl alcohol are mixed and oscillated to be uniform; then, after second-time standing is performed, the clear solution is added into the mixed solution, a fluid medium and magnetotactic bacteria are added and oscillated and mixed to be uniform; the oscillated mixed solution is centrifuged and separated, a supernatant is sampled to be filtered, and finally the adsorption process is completed. The method is simple in treatment process, can treat sewage with the low metal ion concentration, and is not high in operation cost and raw material cost, good in heavy metal ion adsorption effect and high in selectivity, andthe removal rate for Cu2+, Pb2+ and Cd2+ can reach up to 99%.