The invention discloses an active snow-melting agent capable of realizing slow release based on a coupling reaction, and a preparation method thereof, and belongs to the technical field of pavement snow-melting materials. The active snow-melting agent comprises a salt release material, a carrier material, an adhesive, a corrosion inhibitor, a water repellent and a coupling agent. The carrier material is prepared by mixing phosphoric acid with steel slag in proportion; and the corrosion inhibitor is prepared by mixing sodium gluconate, zinc dihydrogen phosphate and thiourea in proportion. The method has the advantages of innovative solving of the problem of difficult treatment of enterprise waste residues and the problems of pollution and damages to capital construction facilities and poordurability of snow-melting agents, reduction of waste pollution, social resource saving, protection of the ecological environment, and creation of many economic and social benefits.