Due to high conductivity and large specific surface area, 2D titanium carbide (Ti₃C₂T_x) can be used as an electrode material for supercapacitors with high energy density. However, the deactivation of Ti₃C₂T_x through irreversible oxidation in energy storage and the poor surface interaction between Ti₃C₂T_x and substrates result in poor cycle stabilities of Ti₃C₂T_x supercapacitors, thereby greatly hindering wide applications of energy storage materials. In this paper, Ti₃C₂T_x is used as an active layer and covered by a graphene oxide (GO) film. The GO film weakens the oxidation deactivation of Ti₃C₂T_x. Meanwhile, a heat treatment procedure of the electrode is involved to improve the surface interaction. This makes the cycling stability of the Ti₃C₂T_x/GO composite electrodes significantly improved, and the capacitance is higher than the initial one after 5000 cycles. The results can provide an innovative pathway for the design and preparation of high cycle-stability supercapacitors.