A method for manufacturing a molybdenum disulfide powder includes conducting a precursor solution preparation step and a hydrothermal synthesis step. The precursor solution preparation step includes providing sodium molybdenum oxide dehydrate and thiourea, and conducting a mixing step. In the mixing step, an acid solution is mixed with the sodium molybdenum oxide dehydrate and the thiourea by titrating so as to form a precursor solution. In the hydrothermal synthesis step, the precursor solution is put into a hydrothermal container for reacting at a temperature ranging from 100° C. to 350° C. for 8 hours to 40 hours, thus the molybdenum disulfide powder is formed.
