With self-combusting gangue as raw material, fly ash and low dosage of composite Portland cement P·C 42. 5 as supplementary materials, geopolymer low-strength grouting materials based on self-combusting gangue were prepared by the excitation of calcium carbide slag, and the samples were microscopically analyzed. The experimental results show that when the amount of calcium carbide slag mixing ( 9. 65% , mass fraction ) is the same, the compressive strength development of samples is more favorable when the mass ratio of gangue, fly ash and cement is set to 5 ∶ 3 ∶ 2 or 5 ∶ 2 ∶ 3, the geopolymerization of the sample system is higher and the compressive strength (55 d) increases by 70% ~ 86% compared to the samples with mass ratio of 7 ∶ 2 ∶ 1 and 7 ∶ 1 ∶ 2. At the same time, compared with the samples without adding desulfurization gypsum, adding 20% (mass fraction) desulfurization gypsum greatly improves the compressive strength of samples during the whole process of curing, and the compressive strength ( 55 d) increases by 21% ~ 50% . The combination of correlation, XRD, SEM and FTIR analyses indicate that the main hydration products of samples are ettringite, C-S-H gel, C-A-S-H amorphous gel and others, and the compressive strength of samples is mainly derived from the C-A-S-H amorphous gels produced by geopolymerization.