The invention provides a nano-composite, a preparation method therefor and an application thereof. The nano-composite has an embedding covering composite structure of ultra-thin MoS2 nano-sheets and Sb nano-sheets, and belongs to the technical field of preparing a sodium-ion battery electrode material. The MoS2/Sb nano-composite is prepared by one-step synthesis using solvothermal method. The volume expansion of Sb in the processes of charging and discharging can be effectively alleviated by MoS2 while Sb can prevent the MoS2 nano-sheets from superimposing. The cycle stability and sodium storage performance of the composite as a sodium-ion battery negative electrode material are improved by the synergy effect of the two materials. The preparation process of the nano-composite is simple with a high repeatability, stable products and short production period, and is favourable for convenient production. The MoS2/Sb composite prepared according to the method has a two-dimensional embedding covering structure, and has the features of high reversible specific capacity and excellent cycle stability as a sodium-ion battery negative electrode material.