In order to study the solidification / stabilization effect of environmental protection material geopolymer on lead contaminated soil, based on the research background of heavy metal lead pollution and solid waste resource utilization in arid and semiarid areas, a new solidified material geopolymer was prepared by using blast furnace slag and cement, and the macroscopic mechanical performance and microscopic mechanism of solidified heavy metal lead were discussed. Based on the cement-based solidification of heavy metal lead-contaminated soil, the strength performance and toxicity leaching performance of geopolymer-cement under different proportions were explored, and the microscopic test characterization of the outstanding performance group was carried out. The test results show that compared with cement-based and other groups, 80% slag geopolymer combined with cement has better performance of solidification/stabilization of heavy metal lead, and the compressive strength and toxicity leaching results under pollution degree ③ are significantly better than other groups. phase analysis of X-ray diffraction (XRD), scanning electron microscope (SEM), nuclear magnetic resonance(NMR) and other tests show that the internal structure of 80% slag geopolymer is complete and dense, the internal changes of cement solidified body are severe, the hydration reaction is inhibited by heavy metals, the overall structure is loose, and the density is low and discontinuous.