This two part LNCS volumes constitutes the refereed proceedings of the 19th CCF Conference on Computer Supported Cooperative Work and Social Computing, ChineseCSCW 2024, held in Hohhot, China, in July 12-14, 2024. The 52 full papers and 18 short papers included in this book were carefully reviewed and selected from 200 submissions. They were organized in topical sections as follows: Part-I: Trend; CSCW and Social Computing, and Human-Machine-Things Fusion and Human-AI Collaborative Computing. Part-II: Crowd Cooperative Computing and Evolutionary Computation, and Collaborative Data, Software and Services.