A cauliflower-like CuS/ZnS@rGO nanocomposite was selectively synthesized via a facile hydrothermal reduction method using Cu2O nanocrystals as the sacrificial template. Using this nanocomposite as the counter electrode (CE) in a dye-sensitized solar cell (DSSC) yielded excellent performance with a high-power conversion efficiency (PCE) of 8.45% and outstanding electrochemical stability. Experimental measurements confirmed that the CuS/ZnS heterojunction was uniformly inlaid on the reduced graphene oxide (rGO). This arrangement helped enhance the synergetic effect of the heterojunction, thereby avoiding the frequent recombination of electron-hole pairs to increase the efficient use of electrons, as confirmed by the behavior of the semiconductor. Furthermore, rGO dispersed the active sites and facilitated the transfer of electrons. As the CE of a DSSC, compared with CuS and ZnS CEs, the rGO@CZS composite dramatically enhanced performance and provided outstanding electrochemical stability. Hence, the results indicate that our material could be utilized as the all-important CE of DSSCs. (C) 2018 The Electrochemical Society.