Medical crowdfunding and commercial health insurance are two forms of supplemental assistance that play important complementary roles in China's multi-level medical insurance system, but few studies have considered the interactions between the two. This paper investigates the impact of the presence or absence of medical crowdfunding and the disclosure of information about fundraising success rates on commercial health insurance purchase decisions, recruiting 63 participants for a laboratory behavioral experiment and collecting data. The results show that the presence of medical crowdfunding significantly reduces insurance purchase rates. In addition, disclosure of fundraising success rate information in healthcare crowdfunding increases insurance purchase rates compared to no fundraising success rate information, and the level of fundraising success rate moderates this effect. Specifically, high fundraising success information decreases the insurance purchase rate and negatively moderates the effect, while low fundraising success information increases the insurance purchase rate and positively moderates the effect. In particular, this paper also validates the robustness of the results with 224 questionnaire data. The findings enrich and supplement the field of medical crowdfunding and commercial health insurance, and provide empirical evidence to promote the synergistic development of medical crowdfunding and insurance industry in China.