The invention discloses a production technology of a molten steel refining furnace slag melting agent. The production technology comprises the following steps that (1) activated clay powder, talcum powder, palygorskite powder, smectite powder, quicklime powder, fluorite powder, mineral wool and a binder are added into a mixer by weight, meanwhile, 22-30 parts of water is added, mixing is performedfor 1-1.5 h under the rotating speed of 300-500 r/min, and uniform slurry is prepared; (2) the uniform slurry is added into a mould and made into particles with the grain size being 0.8-1.2 cm through vacuum suction filter forming; and (3) the particles are fed into a drying oven, drying is performed for 8-10 h under the temperature of 82-93 DEG C, and the slag melting agent is prepared. The slagmelting agent provided by the invention contains the components including the activated clay powder, the talcum powder, the palygorskite powder, the smectite powder, the quicklime powder and the fluorite powder with the low melting points and high activity, impurities including hydrogen, oxygen and the like in molten steel can be removed easily, the contents of the harmful elements such as the hydrogen and the oxygen in the steel are decreased, and accordingly, the mechanical performance of high-purity 18 high manganese steel is improved.