Based on the data of 106 Chinese listed manufacturing companies from 2013 to 2018, this research uses a panel data model to study the relationship between the width and depth of knowledge search and the innovation quality of enterprise, and analyzes slack resources and absorptive capacity impact on the above relationship. The results show that both the width and depth of knowledge search positively promote the innovation quality of enterprise. Slack resources have a significant positive regulating effect on the positive relationship between knowledge search depth and enterprise innovation quality, but not on the positive relationship between knowledge search width and enterprise innovation quality. Absorptive capacity negatively moderates the positive relationship between knowledge search width and enterprise innovation quality, but has no significant moderating effect on the positive relationship between knowledge search depth and enterprise innovation quality.