Abstract: With the advent of 5G era, the heating power of various electronic components has increased significantly. Therefore, the problem of heat dissipation of electronic components and equipment needs to be solved urgently, which makes the demand for high thermal conductivity materials increasingly urgent. The two-dimensional MXene material (Ti₃C₂T_x) was prepared by chemical etching method, and the MXene/silicone rubber composites were obtained by using standard solution blending method. The effect of the addition amount of MXene on the thermal conductivity of the MXene/silicone rubber composites were studied. SEM and XRD were used to characterize the structure of MXene, and the mechanical properties, thermal conductivity and thermal stability of pure silicone rubber and the composites were tested. The results show that the classic accordion layered MXene is successfully prepared by chemical etch method. When the added MXene is 2.00wt%, the thermal conductivity of the composites is up to 1.32 W/(m·K), which is 4.55 times that of pure silicone rubber. At this time, the volume resistivity of the composites is reduced by 4 orders of magnitude. The mechanical properties and thermal stability of silicone rubber are also improved remarkably.