The invention relates to an electrode structure for preparing ethylene through electrocatalytic reduction of CO2 and a preparation method. An electrode is mainly composed of a conductive supporting layer and Cu-Cu2O embedded to the surface layer, wherein the Cu-Cu2O is prepared in an electrodeposition manner. Synthetic raw materials of the electrode structure are copper sulfate and lactic acid, the mole ratio of the copper sulfate to the lactic acid is 1: (5-20), and by modulating electrodeposition parameters, control over CO2 reduzate, namely ethylene is achieved. The structure that a cathode is embedded into copper has the characteristics that the selectivity of ethylene in CO2 electrocatalytic reduzate can be improved, and the stability of electrode running can also be improved. The preparation method is simple, and the prepared electrode has relatively-high ethylene selectivity and is suitable for being produced on a large scale.