The invention belongs to the field of compound metal coating layers, and particularly relates to preparation and application of an antibacterial and anti-corrosion capsaicine composite ZnO/Zn coatinglayer. The antibacterial and anti-corrosion capsaicine composite ZnO/Zn coating layer is obtained by compounding capsaicine with alkaline deposited liquid under a constant-current depositing conditionto obtain a zinc array having pores in the surface, then drying the zinc array under a nitrogen environment to allow the surface of the zinc array to naturally form a ZnO nano needle in air, and obtaining the product. The needle-like ZnO can be formed on the surface of the capsaicine composite ZnO/Zn coating layer disclosed by the invention, so the capsaicine composite ZnO/Zn coating layer is high in antibacterial and anti-corrosion property; and the capsaicine composite ZnO/Zn coating layer is suitable for protecting a steel structure in a biological activity-polluted water environment or marine environment, and has a good staining protection application value.