The invention belongs to the technical field of new energy sources, in particular to a lithium carbon dioxide battery electrode sheet without binder and conductive agent and a preparation method thereof. The method comprises the following steps: S1, placing the foamed nickel which has removed the surface oxide layer in a copper salt solution, and then cleaning and drying the foamed nickel; S2, placing the dried foamed nickel in a mixed solution for hydrothermal reaction, taking out, cleaning and drying to obtain a battery electrode sheet precursor; The mixed solution contains copper ions and nickel ions, and a homogeneous precipitant is added; S3, placing the precursor of the battery electrode sheet in a position containing S<2->, After the reaction in the solution, take out, wash, dry, get the battery electrode piece. The method needs no binder and conductive agent, is simple in manufacturing process and low in cost, and ensures effective diffusion of carbon dioxide gas at the same time.