The Internet platform is a key pillar of the digital economy, with complementors playing an indispensable role in their success. Although research on the Internet platform and complementors is rapidly emerging, comprehensive reviews and summaries are still lacking. To address this gap, this paper searches 198 related literatures published on core journals at home and abroad, and systematically combs the research on the Internet platform from the perspective of complementors. The review covers five main areas: influencing factors of complementors entering and exiting the platform, strategies used by complementors to adapt to platform governance, impact of complementors on platform performance and governance decisions, interactions between complementors, and impact of complementors’ characteristics and behaviors on their own performance. Finally, based on the current development context of the Internet platform in China, this paper carries out a systematic review and future outlook on the research topic of complementors on the Internet platform, with a view to inspiring and advancing the theoretical and practical development of the research on complementors on the Internet platform in China.