This study defines and classifies the liability recourse strategies of platform e-commerce, and explores the impact of liability recourse strategies on the collective reputation of platform e-commerce. On this basis, the social support theory is introduced to discuss the synergistic effect between the responsibility recourse strategy and the platform service strategy. This study adopts the method of scenario experiment, and the experimental results show that: compared with punitive liability recourse strategy, compensatory liability recourse strategy has a more significant positive impact on the collective reputation of platform-based e-commerce companies; both informational support and affective support can positively moderate the impact of liability recourse strategy on the collective reputation of platform e-commerce companies; the role of the online consumer also plays a moderating role. For the victim, the compensation strategy has a stronger positive impact on the collective reputation of the platform e-commerce than the punitive demand strategy. For observers, there is no significant difference in the effects of the two strategies.This study provides a useful theoretical contribution and practical inspiration for the reputation management of the platform e-commerce market.