Abstract: In public health emergencies, people are more willing to save money rather than spending it, which is not conductive to economic development and recovery. Due to the absence of relevant research, the internal logic of this phenomenon is not clear. In the context of the COVID-19 pandemic, this study systematically explored whether and why public health emergencies stimulate consumers’ preference for saving (vs. spending). We conducted two online surveys and used methods including stepwise regression analysis and bootstrapping to test the hypotheses. The fifirst survey, with 1,511 participants from China in February 2020, indicates that the severity of emergencies has a signifificant positive impact on the populations’ willingness to save (vs. spend). Risk perception plays a mediating role between the severity of emergencies and consumers’ saving (vs. spending) willingness. Materialism plays a moderating role between risk perception and an individual’s saving (vs. spending) willingness, individuals who are more materialistic have a lower saving (vs. spending) willingness when they perceive the risks of the pandemic. To verify the duration of the above effects, we conducted a follow-up survey consisted of 466 instances in August 2020. It is noteworthy that the above effects are not signifificant during the post-pandemic period. Thus, spending behavior in public health emergencies can be motived by reducing risk perception and increasing materialism. These fifindings can provide a valuable inspiration for public health, crisis management, and economic recovery during public health emergencies.