The invention belongs to the technical field of nanometer material, and discloses a rhenium disulfide nanosheet used for hydrogen evolution reaction, and a preparation method and applications thereof.According to the preparation method, Re-Te co-molten alloy and sulfur powder are taken as raw materials, FTO electro-conductive glass is taken as a substrate, chemical vapor deposition is adopted, atinert atmosphere, the Re-Te co-molten alloy is introduced into a quartz tube, is heated to 450 to 500 DEG C in a constant temperature zone I for thermal insulation treatment; the sulfur powder is placed on a carrier gas upstream end of the same quartz tube, and is heated to 120 to 170 DEG C in a constant temperature zone II for thermal insulation treatment, so that Re steam in the Re-Te co-moltenalloy and sulfur steam are reacted, and anisotropic growth on the FTO substrate is realized to obtain a finished product. According to the rhenium disulfide nanosheet, ReS2 nanosheets are verticallyarranged on the FTO substrate, the edges of the ReS2 nanosheets possess a large amount of electrochemical active sites for combination with the FTO substrate, the rhenium disulfide nanosheet can be taken as a hydrogen evolution reaction electrode, and is promising to be used in catalytic hydrogen production field.