Aiming at the problems of steel slag solid waste occupying resources and polluting the environment,the combination of steelslag and CO2 mineralisation and sequestration technology can achieve the resourceful use of industrial solid waste and CO2. Through thestudy of steel slag-fly ash composite alkali-inspired cementitious materials in the natural and mineralisation maintenance conditions,different CaO and water glass dosing,water glass modulus,mineralisation maintenance pressure and length of time on the samples of thecarbon sequestration rate and compressive strength of the samples,under the condition that the mass fraction of CaO and the modulus ofthe water glass of 2.2 are 15% and 4% respectively,it is found that the samples of carbon sequestration and compressive strength of thecarbon sequestration rate and compressive strength of the samples are up to 7.86% and 158 MPa, respectively, with the best overallperformance. Among them,CaO doping and the carbon sequestration rate of the samples are positively proportional to each other,whenthe doping mass fraction of CaO was 0, the carbon sequestration rate was only 0.35%. When the doping mass fraction of CaO wasincreased to 15 %,the carbon sequestration rate was up to 7.86%,which shows that CaO plays a decisive role in the enhancement ofcarbon sequestration rate. With the increase of mineralisation maintenance pressure,the carbon sequestration rate increases from 4.82%to 7.86%. When the duration of mineralisation conditioning was increased from 0.25 h to 1.5 h,the increase of carbon sequestration ratewas 124%. XRD results show that after 28 d of mineralisation maintenance,the diffraction peak of Ca(OH)2 disappeared and the calcite content increased significantly,which shows that Ca(OH)2 carbonates with CO2,generating a large amount of calcite with better stability and effectively realizing CO2 sequestration. The results of SEM test show that a large amount of calcite generated from the samples after mineralisation conditioning is closely attached with C−S−H gel and fly ash vitreous body,which is conducive to the improvement of compressive strength. The pore distribution before and after CO2 conditioning is determined by mercury compression test. Compared with natural conditioning,the pore space of the samples after mineralisation conditioning decreases dramatically,and the mineralisation products play a good role in filling up,so the strength of the samples is significantly improved. Combined with the economic analysis,it is found that the mineralised steel slag-fly ash alkali-inspired cementitious material has good comprehensive performance and economic benefits.