| A detection method of a copper foil surface includes a blackbody grafting operation and a surface detection operation. The blackbody grafting operation includes grafting a first functional group modified on a surface of a copper foil with a blackbody material, so that the blackbody material is grafted onto the first functional group. A surface of the blackbody material is modified with a second functional group that can be grafted onto the first functional group. The surface detection operation includes using an infrared thermal imager to detect the surface of the copper foil grafted with the blackbody material, to obtain an infrared thermal image, which corresponds to a distribution state of the first functional group modified on the surface of the copper foil, as visualized through imaging of the blackbody material. |