The invention discloses a preparation method for a NiS2/CoS2 counter electrode of a dye-sensitized solar cell. The preparation method comprises the steps of pouring a mixed solution containing potassium persulfate, nickel sulfate and ammonia water into glass ware loaded with an FTO conductive substrate, allowing the mixed solution to stand, performing washing and drying, and performing in-situ growth on an FTO surface to obtain a precursor; placing the precursor in cobalt nitrate solution for immersion, and taking out and drying the product; and respectively placing the FTO and a sulfur source which are immersed by the cobalt nitrate solution in a vacuum tubular furnace, rising a temperature to 350-550 DEG C under argon protection, performing heat preservation for 2 hours, and obtaining the NiS2/CoS2 counter electrode after cooling. The preparation process for the NiS2/CoS2 counter electrode, disclosed by the invention, is simple, a heterojunction of a nanosheet and nanoparticles is formed, the catalytic active sites of the electrode are added, a nanosheet structure growing perpendicularly is beneficial for diffusion of an electrolyte, the diffusion resistance is reduced, so that the NiS2/CoS2 counter electrode has higher electrocatalytic activity, and the photoelectric conversion efficiency is improved.