The geopolymer is considered to be a green cementitious material that likely to substantially replace cement in the 21st century. This paper summarized the research status and progress of geopolymer in the aspect of soft soil solidification. The current geopolymer precursor and activator for soft soil solidification were introduced. The principle and mechanism of solidifying soft clay by geopolymer were summarized. The deformation and strength characteristics of geopolymer solidified soils were analyzed according to the laboratory element test results. The permeability and durability performance of the geopolymer solidified soils were discussed. The environmental impact and engineering applications of solidifying soft clay by geopolymer were summarized. Compared with the cement solidified soil, the geopolymer solidified soil had better mechanical properties with the same admixture, and it had lower CO2 emissions. Therefore, the polymer can be used to replace cement for solidifying soft soil. In the future, geopolymer precursors with better performance and green activators should be further developed, and the macro- and micro-mechanical properties of different types of geopolymer solidified soils should be further investigated.