The invention relates to a method for preparing reduction chromium powder through microwave heating and belongs to the technical field of microwave metallurgy. The method comprises the steps that firstly, Cr2O3, charcoal and coal are smashed, and then the Cr2O3 and the charcoal are evenly mixed to obtained a mixed material; secondly, materials are distributed in a layered mode, wherein the mixed material obtained in the first step is distributed and arranged on the bottom layer, and the smashed coal powder which is prepared in the first step and accounts for, by mass, three to four percent of the mixed material is distributed and arranged on the upper layer; thirdly, the materials arranged in second step are put in a microwave reactor to be heated to 1300 DEG C to 1400 DEG C with heat preservation carried out for 30 min to 60 min, the reduced and heated furnace charge is cooled, smashed and screened, and thus the reduction chromium powder is obtained. According to the method, due to the fact that microwaves are taken as a heating source, the temperature increasing speed and the heating efficiency are improved, the obtained product is made to be in a fluffy state, and meanwhile the rawish phenomenon is avoided.