The invention relates to the technical field of ferromolybdenum smelting, in particular to a fluoride-free low-nitrogen-sulfur ferromolybdenum smelting raw material, a ferromolybdenum green smelting system and a ferromolybdenum green smelting method. The method discloses a high-temperature-resistant magnesium alloy which comprises 4-5 parts of molybdenum oxide, 0.2-0.4 part of quick lime, 1.2-2 parts of iron phosphorus, 0.5-1.2 parts of metal silicon powder, 0.2-0.4 part of aluminum particles, 0.4-0.9 part of steel scraps and 0.05 * 10 <-3 >-0.25 * 10 <-3 > parts of magnesium bars. Through thedesign of the fluoride-free low-nitrogen-sulfur ferromolybdenum smelting raw material, the problems that in the prior art, in current ferromolybdenum smelting, more or less nitratine is used as a heat supplementing agent, a certain amount of nitrogen dioxide gas is generated after the nitratine reaction, environment-friendly equipment is not in place, a certain amount of nitrogen dioxide is discharged into air, and the environment is polluted are solved; and meanwhile, in order to improve the fluidity of slag in traditional smelting, fluorite can be used, and calcium fluoride in the fluoritecan pollute the environment to a certain extent as well.