Geopolymer, as a new soil solidification agent, is a kind of green inorganic cementitious material formed by aluminosilicate-rich minerals as precursors under the action of alkali activators. It is equipped with the advantages of good mechanical properties, excellent durability, low carbon and environmental friendly, etc. It can effectively overcome the disadvantages of high energy consumption, high pollution and poor durability of traditional soil solidification agent such as cement or lime, and is generally considered as an ideal substitute for traditional soil solidification agent by scholars at home and abroad. In order to clarify the solidification mechanism and reinforcement effect of geopolymers on soil, the research progress of geopolymer solidified soil in recent years is reviewed in this paper. Firstly, the reaction mechanism of geopolymer solidified soil is introduced; secondly, the influence of different factors on the mechanical properties such as unconfined compressive strength and shear strength of geopolymer solidified soil is described in detail; then the durability of geopolymer solidified soil under freeze-thaw cycle, dry-wet cycle and chemical ion erosion is discussed; finally, the future development direction of geopolymer solidified soil technology is prospected.