Nanosheet molybdenum disulfide (MoS2) electrode materials for supercapacitor were prepared by high-temperature solid-phase method combined with ball milling using sodium molybdate and thiourea in a Mo to S molar ratio of 1:15 as raw materials. The thermal stability, phase structure and microstructure were characterized by thermogravimetric-differential scanning calorimetry, X-ray diffraction and scanning electron microscopy. The eletrochemical properties of the samples were tested by cyclic voltammetry (CV), galvanostatic charge/discharge cycling (GCD) and electrochemical impedance spectroscopy (EIS). The results show that the number of MoS2 layers prepared by sintering at 750 ℃ and ball milling at 700 r·min-1 for 10 h is 88. The specific capacitances of the samples are 82.4 and 60.9 F·g-1 at the current density of 0.5 and 1 A·g-1, respectively (better than 54.6 and 24.0 F·g-1 before ball milling). After 2 000 cycles, the specific capacitance retention rate is 92%.