The invention discloses an electrochemistry preparation method for a nanometer Ag embedded type electrode material and belongs to the field of capacitive materials. The electrochemistry preparation method for the nanometer Ag embedded type electrode material comprises the steps that firstly, original Co3O4 nanosheet arrays are acquired through an electro-deposition method, and the original Co3O4 nanosheet arrays are calcined for 1-2 hours at the temperature ranging between 400 DEG C and 500 DEG C so that the Co3O4 nanosheet arrays are turned into Co3O4 nanosheets; and secondly, based on the above, the Co3O4 nanosheets are supported through electro-deposition of multiple layers of nanometer Ag so that support fixing can be conducted dependent on the nanometer Ag between the multiple layersof Co3O4 nanosheets, and the nanometer Ag embedded type electrode material is prepared. According to the electrochemistry preparation method for the nanometer Ag embedded type electrode material, thenanometer Ag embedded type electrode material is prepared and acquired through the electro-deposition method; the preparation technology of the material is simple; the material prepared is provided with a porous pore passage, large in specific surface area and novel in morphology; and the material prepared is a catalytic material with a nanometer dimensionality superstructure link and can be widely applied to fields such as energy conversion and storage and catalysis.