In the era of the digital economy, establishing harmonious labor-capital relations is an intrinsic requirement for maintaining digital labor justice and serves as a foundational guarantee for promoting high-quality development of the digital economy. This study starts with analyzing the essential characteristics of capital, clarifying the contradictions of digital contracts and their alienation principles present in digital platforms. It then addresses issues regarding the safeguarding of labor rights within platform contractual relationships in China. Finally, it proposes strategies on three dimensions of institutions, platforms, and technology. The research tends to conclude that digital labor justice serves as a contractual guarantee and value guidance for labor rights on capital platforms. By reinforcing digital labor sovereignty through state power, improving labor rights protection systems, regulating capital platforms and algorithmic power, and rationally distributing benefits between platform labor and capital, a human-centered technological value perspective can be established to foster the coordinated development of digital labor justice and the digital economy.