With ground granulated blast furnace slag as the main materiala slag-carbide slag based geopolymer was prepared under the excitation of alkaline carbide slag. Through XRDSEMEDSFTIRTG-DSC and other microscopic testing techniquesthe performance and action mechanism of the slag-carbide slag based geopolymer were analyzedand the heavy metal leaching test was carried out for the geopolymer. The results show that when the mass fraction of carbide slag is 14% and the water to cementitious material is 0.34the compressive strength of the slag-carbide slag based geopolymer is 31.8 MPa under the condition of 4 d ambient temperature curing and 32 h steam curing. The hydration products of geopolymer are mainly calcium aluminosilicate hydratecalcium carboaluminate hydrate and a small amount of ettringite crystals. The concentration of heavy metals in the leaching solution meets the national toxicity control standard indicating the safety of geopolymer. Carbide slag has good effect on alkali activation of slag.