The invention belongs to the technical field of mine filling, and concretely relates to a cementing material for a sulfide-containing tailing cemented filling body. The cementing material is preparedfrom, by weight, 0.1-2 parts of water glass, 0.1-2 parts of carbonate, 1-15 parts of active magnesium oxide and 81-99 parts of granulated blast furnace slag powder. A cementing material and sulfide mine tailing cemented filling body has the advantages of no cracks, no reduction of the compressive strength in the late stage, and good economic benefit.