BackgroundNew water-soluble fertilizer can be applied to modern irrigation systems and has significant advantages. This study uses wet-process phosphoric acid as raw material and chelation and suspension technology to prepare water-soluble fertilizer containing high-concentration ammonium phosphate. MethodsFirst, the composition and viscosity of the wet-process phosphoric acid was analyzed, and the ammoniation and chelation processes were explored. Subsequently, four suspension formulations were compared and selected after product analysis. The final process conditions are: 42 wt % (P2O5 %) phosphoric acid, 20 wt % chelating agent, pH = 4.5, 0.03 wt % xanthan gum or 0.02 wt % carboxymethyl cellulose of respectively, and obtain suspension fertilizer by high-speed shearing. Significant FindsThe Bingham model and Casson model were used to fit the rheological data of the two, and R2 values were greater than 0.94. The thixotropic loops of the two were measured using the triangular shear rate variation method mode, and the Huang equation and MBM models were used to fit the thixotropic loop data of the two respectively. In addition, at different pH and temperature, the suspended fertilizer performed well.