The invention discloses a preparation method for a NiSe counter electrode of a dye-sensitized solar cell. The preparation method comprises the following steps of adding 0.01-1.03mol of hydrazine hydrate to deionized water, adding 0.05-0.6mol of selenium powder, and stirring the mixture until the mixture is completely dissolved to form a mixed solution; placing a cleaned nickel sheet in a hydrothermal kettle, and pouring the mixed solution; and performing hydrothermal reaction for 2-24 hours under a condition of 100-200 DEG C, naturally cooling to a room temperature, taking out a sample, and washing and drying the sample, wherein the sample can be used as the counter electrode. The preparation process for the NiSe counter electrode, disclosed by the invention, is simple and cheap, is short in preparation period and is convenient to operate, and rapid and mass production can be achieved; and meanwhile, the prepared counter electrode has the advantages of high conductivity, high filling factor, good catalytic activity and excellent photoelectric conversion efficiency.