Abstract: The present invention provides a coated steel plate suitable for an inline thin-film photovoltaic module, comprising a steel substrate and a composite insulating layer on the surface of the steel substrate. The composite insulating layer comprises an insulating base layer and a laser scribing buffer layer; one side of the insulating base layer is the steel substrate, and the other side is the laser scribing buffer layer. The laser scribing buffer layer contains at least one of the following components: SixNy, where 0.75?x:y?1; and Si1-x?(R)x?Oy?, where R is an element selected from Sb, Au, Cu, Sn, and Ag, and 0<x??0.05, 1.9?y??2.