The invention discloses a preparation method for preparing two-dimensional layered transition metal sulfide. The two-dimensional layered transition metal sulfide is mainly an MAX-phase ceramic powderraw material composed of the following elements. Wherein the M element is Ti, Nb, V, Y, Nb, Mo, Ta, W, Hf, Cr and Mn; wherein the element A is Al, Si, Ge, Sn, Ga and Sb; powder of max-phase ceramic ofwhich the X element is B, C, N and Si and powder of MAB-phase ceramic are used as raw materials; in the atmosphere containing H2S, H2Se and H2Te gas, the powder is heated for more than 5 hours withinthe temperature range of 500-1400 DEG C, and organ-shaped TMDCS powder can be obtained after the obtained powder is subjected to ball milling. According to the method, a CVD method and a mechanical stripping high-cost method for preparing the TMDCS are eliminated, an organ-shaped structure which cannot be obtained through the CVD method and the mechanical stripping method can be obtained, the cost is obviously reduced, and application and popularization of a two-dimensional TMDCS material are often facilitated.