A large amount of abandoned dredged silt generated by river dredging needs to be effectively disposed of，while the traditional cement curing agent is a material with high energy consumption and high carbon emission，which is not consistent with the current ecological concept. With mineral powder as the main raw material and sodium silicate as alkali activator to prepare a new type of low carbon geopolymer cementing material solidified silt as engineering filler，we carry out an experiment and analysis of the mechanical property and compressive property of geopolymer solidified soil. The results show that compared with the solidified soil with 10% cement content，the unconfined compressive strength of geopolymer solidified soil with 10% mineral powder content increases by 406.1% for 28 d，and the failure form of solidified soil changes from plastic failure to elastic failure. The stress-strain curve shows obvious stress peak，which could better meet the needs of common filling materials. It has good ecological benefit and broad application prospect. Thus it can provide an effective way for recycling dredged wastes.