A method of electrochemical deposition solar cell metallic electrode includes the following steps: the cathodic surface of the solar cell contacts with the electrolyte solution; the anodic of the solar cell connects with the solid metal; the main light surface of the solar cell execute light irradiation; the metallic ion in the electrolyte solution creates metal and deposits on the cathode surface of the solar cell, after accepting the electric produced by the cathode surface of the solar cell, meanwhile the solid metal creates metallic ion into electrolyte solution, after providing electric for anodic of the solar cell. The method resolves a battery efficiency descendent problem caused by the short circuit during depositing metal on anodic, at the same time breakage solar cell piece by any electroplating rack and the inhomogeneous probable by deposited metal are avoided, and can control the electrochemical reaction velocity effectively, assure the deposited metallic homogeneity, especially for producing a solar cell with selective diffusion structure.