The invention discloses steel slag sulphoaluminate-based expanding type base layer stabilization special cement, which is prepared from the following ingredients in parts by weight: 10 to 45 parts of steel slag, 20 to 60 parts of portland cement clinker, 10 to 25 parts of sulphoaluminate cement clinker and 3 to 15 parts of gypsum. The portland cement clinker and the sulphoaluminate cement clinker are used in a compound way; solid wastes such as the steel slag and the gypsum are effectively used; the initial setting time of the cement material is greater than or equal to 6h; the final setting time is smaller than or equal to 10h; the 7-day linear expansivity is greater than or equal to 0.15 percent; the 28-day free expansivity is smaller than or equal to 1.0 percent; after popularization and application, the important significance is realized for promoting the comprehensive utilization of the steel slag and improving the anti-cracking performance and the strength of a pavement base layer; meanwhile, the cement production cost is effectively reduced.