Based on signaling theory, we explore the impact of corporate fraud on firms' innovation performance. First, we propose that corporate fraud harms firms' innovation performance. This is because, as a negative signal, fraud makes it difficult for firms to obtain the policy, funding, and human resources needed for outstanding innovation performance. We further argue that the institutional aspects of the signaling environment (e.g., industrial competition, regional institutional development, and social trust) will influence core stakeholders' reception and interpretation of fraud signals. These factors, in turn, moderate the signaling effect of corporate fraud on firms' innovation performance. Our views are supported by empirical and robustness tests using Chinese A-share listed firms from 2010 to 2019.