To solve the problem of the continuous increase in the stockpile of phosphogypsum produced as a byproduct in wet process phosphoric acid production, phosphogypsum is purified and used as a raw material to produce secondary-element soil conditioner. The process flow of producing secondary-element soil conditioner and product quality indicators are introduced. A field plot experiment is conducted using potatoes as the research object, with single application of chemical fertilizer as the control (CK) treatment, and the combination of chemical fertilizer and secondaryelement soil conditioner (T treatment). The results show that compared with CK treatment, T treatment increases potato yield by 11.51% and economic benefits by 28.65%. The use of purified phosphogypsum as a source for the production of secondary-element soil conditioner not only helps alleviate the problem of increasing phosphogypsum storage, but also turns waste into treasure and broadens the utilization of phosphogypsum.