Method for treating nitrophosphate fertilizer wastewater

The invention provides a method for treating nitrophosphate fertilizer wastewater. Firstly a Mg salt precipitant is prepared in a precipitant compounding tank, a solvent adopts nitrophosphate fertilizer pickling production wastewater, and a Fe salt coagulant is prepared in a coagulation compounding tank by using the nitrophosphate fertilizer pickling production wastewater. The nitrophosphate fertilizer pickling production wastewater, the Mg salt precipitant and the Fe3+ salt coagulant are added to a stirring reaction kettle in proportion, mechanical stirring is started, a solutionafter the reaction crystallization is sent to a centrifugal separator by a pump, the separated clear liquid is recycled, and a solid phase material is collected and dried in a desiccator and used as aslow release fertilizer material for struvite. The method has the advantages that after precipitation-coagulation treatment, fine particles of the nitrophosphate fertilizer pickling production wastewater are condensed into la