The invention provides a transition metal chalcogenide nanosheet material and a preparation method thereof, a battery anode material, a secondary battery and an application thereof, and belongs to thetechnical field of transition metal chalcogenides. The invention provides a preparation method of a transition metal chalcogenide nanosheet material, comprising the following steps: dissolving raw materials in an aqueous solution of soluble salt, removing moisture to obtain a solid, sintering the solid, and washing to obtain a transition metal chalcogenide nanosheet material, wherein the raw materials include a chalcogen precursor and a transition metal precursor. According to the preparation method, the soluble salt is used as a template, is inexpensive, is environmentally friendly and is easy to remove in post-treatment, and the obtained transition metal chalcogenide nanosheet material has a thinner sheet thickness. Compared with a traditional silica template method or a hydrothermal method, the preparation method of the invention greatly shortens the synthesis cycle, is simple and feasible, is controllable, has characteristics of high yield and simple experimental operation, and issuitable for large-scale production.