Nanotextured diamond-wire sawing (DWS) multi-crystalline silicon (mc-Si) solar cells are successfully fabricated on an industrial scale. The nanotextures are achieved through reactive ion etching (RIE). By introducing the RIEnanotextures, the DWS me-Si solar cells with aluminum back-surface field (Al-BSF) structure exhibit an enhanced optoelectronic conversion, and high power conversion efficiency (PCE) of up to 19.50%. This enhanced optoelectronic conversion is attributed to nanotexture-induced photon management effect, including both efficient reflection reduction and absorption enhancement, and which offset over the increased recombination of charge carriers. The DWS me-Si solar cells are promising for industrial production due to the low raw material cost, high PCE, and manufacturing processes compatible with the existing production lines.