The invention discloses an efficient formic acid production Cu-Sn-Cu laminated foam electrode and a preparation method thereof. The Cu-Sn-Cu laminated foam electrode is of a porous structure, and comprises the following raw materials: a Cu sheet, a Ti plate, sulfuric acid, copper sulfate, stannous chloride, sodium citrate, sodium dodecyl benzene sulfonate and deionized water. The preparation method comprises the following steps: adding copper sulfate into a sulfuric acid solution, performing stirring to serve as an electroplate liquid, and performing first-step electroplating by a hydrogen bubble template method by taking the Cu sheet as a negative pole and the Ti plate as a positive pole; dissolving sodium citrate in deionized water to prepare a sodium citrate solution, adding stannous chloride and sodium dodecyl benzene sulfonate, and performing second-step electroplating to form a porous structure. Through effective regulation and control of electrode preparation conditions, the electrode with a special shape and structure is obtained, the electrochemical reduction catalytic activity in carbon dioxide reduction is improved, the utilization ratio of carbon dioxide is increased, ahydrogen evolution reaction is effectively inhibited, and the product has extremely high formic acid Faradic efficiency.