In the digital age, Information and Communications Technology (ICT) has enabled learning to happen everywhere, leading to a shift of schooling to the home field and strengthening parents' educational responsibilities. Meanwhile, it may also cause the digital divide and digital reproduction, thereby exacerbating educational inequality. Against this backdrop, this study focused on parental digital involvement in online learning and introduced an emerging concept, digital capital, to understand the differences in parental involvement across socio-economic backgrounds at the three levels of the digital divide. Drawing from the analysis of 90 Chinese parents' self-narrated data, this paper identified four types of parental digital involvement according to parents' digital competence and ICT acceptance, and the conversion processes of different forms of capital underlying parental digital involvement were also clarified. The findings from this study expanded the theoretical understanding of inherited cultural capital and social reproduction in online learning in the context of educational digitization.