The invention provides a preparation method of an oxazolidinones compound, and particularly provides a preparation method of a compound as shown in a formula 1 as shown in the description. The preparation method of the compound as shown in the formula 1 comprises the following step: catalytically reducing a compound as shown in a formula 2 in the presence of N-methyl-D-glucosamine to directly generate the compound as shown in the formula 1. By the preparation provided by the invention, reaction steps are simplified, a reaction path is shortened, the yield of a final product can be high, and the purity is good.