Abstract: Digital transformation has become an important strategy for promoting high-quality development of China's manufacturing industry. However, systematic analysis of how e-commerce platform-driven digital transformation affects manufacturing workers' bargaining power remains insufficient. Drawing on the theoretical perspective of labor-value commodity chains, this study explores the mechanisms through which the rise of e-commerce platforms influences garment workers' bargaining power. Employing a combination of interviews and participatory observation, this research draws on the authors' long-term fieldwork data collected between 2011 and 2025 in major garment industry clusters including Guangzhou, Jiaxing, Hangzhou, Dongguan, and other cities. The findings reveal that domestic e-commerce platforms extract substantial traffic fees through their control over traffic and data, while compressing workers' bargaining space via price comparison systems and refund-only policies. Cross-border e-commerce platforms, on the other hand, affect workers' bargaining space through product pricing systems and penalty mechanisms. Workers primarily gain temporary bargaining power through overall labor shortages in the garment industry, structural shortages of all-round skilled workers, and frictional shortages caused by unstable orders. However, their bargaining power remains highly volatile and subject to market conditions. Flexible employment forms such as daily-wage workers and home-based workers are prevalent in the e-commerce garment industry, which undermines workers' informal associational power.