This study used granulated blast furnace slag, steel slag, red mud, calcined gypsum and a small amount of self-synthesized activator CH (made by mixing multiple valence states of alkali) and NS (made by mixing various soluble sulfates and halogen salts) to prepare multivariate solid waste cementitious materials (MSWCM) to solidify sand washing residue mud. The effects of chemical activator type, cementitious material content and curing temperature (20 and 40 ℃) on the compressive strength and microstructure of the solidified body of sand washing residue mud were studied by XRD, MIP and SEM. The water stability and heavy metal leaching characteristics were evaluated. The results show that the MSWCM with addition of CH has the best curing effect on the sand washing residue mud. When the curing temperature and the content of MSWCM are 40 ℃ and 40%, the 7 d compressive strength can reach 5.57 MPa， and the softening coefficient is 0.88. The solidification effect of sand washing residue mud is the worst for MSWCM with addition of NS, because of the lack of a high alkaline environment, which weakens the leaching of calcium and aluminum, reducing the generation of C-S-H and ettringite, and has a high porosity. The use of MSWCM with addition of CH-NS reduces the compressive strength of sample due to the formation of excessive expansion product AFt. By increasing the content of MSWCM and curing temperature, the compressive strength of solidified body of sand washing residue mud increases. The 7 d compressive strength of solidified body of sand washing residue mud at 40 ℃ can be increased by 169.08% compared with the 7 d compressive strength at 20 ℃ by MSWCM with addition of CH. In addition, the leaching content of heavy metals (iron, manganese, titanium) in the solidified body of sand washing residue mud meets the environmental protection requirements.