The present invention discloses a green 
expansive cementing material based on salt 
chemical industry solid waste and building garbage, and a preparation method thereof, wherein salt-containing 
chemical industry waste (salt mud, 
carbide slag and 
mirabilite), building garbage (gravel, broken bricks and concrete blocks), 
steelmaking plant waste residue (water residue and steel residue) and power 
plant desulfuration 
gypsum are matched with an expander, a 
water reducer, a soluble 
calcium salt and other components, and fine 
grinding and uniform mixing are performed to prepare the green 
expansive cementing material. According to the present invention, the salt mud, the 
carbide slag, the 
mirabilite and other 
solid waste produced by the salt 
chemical industry enterprise are digested while the building garbage, the desulfuration 
gypsum, the water residue and other 
solid water are subjected to the 
resource utilization, such that the green 
expansive cementing material is the green 
environmental protection cementing material; and the green expansive cementing material has characteristics of good expansion property, good fluidity, good consolidation property, good early strength, active tightening and effective earth's surface sinking control, is the cementing material for mine, and is particularly suitable for the filling mining of 
coal mines or non-
coal mines.