To explore the internal mechanism of the impact of authentic leadership on employees’ innovative behavior, 302 employees and64 supervisors of knowledge-based enterprises were recruited to complete the questionnaires. The results of the Hierarchical Linear Models(HLM) analysis indicated that: 1) authentic leadership had positive influence on employees’ work engagement and their innovative behavior; 2) employees’ work engagement positively influenced their innovative behavior; 3) employees’ work engagement acted as a partial mediator between authentic leadership and employees’ innovative behavior.