The invention relates to a molybdenum disulfide/gold/nitrogen doped carbon nanotube complex and a preparation method and an application thereof. The preparation method comprises: (Ppy)-MoS4 is put into the water body and oscillated by 2-5h, after completion of adsorption, centrifuge is performed to obtain an adsorption product, and that adsorption product is subjected to calcining to obtain the product; wherein the water body contains Au (III); the (Ppy)-MoS4 is prepared by the following method: nanotubular NO3-Ppy is prepared in water as a dispersion, and (NH4) 2MoS4 is added dropwise to thedispersion, and the reaction lasts for 60-80h, after stirring, pumping and filtering, the reaction product is washed with water and ethanol until the filtrate is colorless, and dried to obtain the finished product; the conductivity of N-doped carbon nanotubes obtained by calcination of the elementary substance Au and Ppy obtained by polypyrrole adsorption of gold ion solution will make up for thedefect of insufficient conductivity of MoS2.