Professional technical employees are the core staff to maintain the normal operation of the organization and the backbone of the workforce. Their levels of innovation influence and restrict the overall innovation performance levels of the corporation to a large extent. Therefore, it is of vital importance to explore and develop the innovation performance of the professional technical employees. The research, combining the theories of psychological capital, is aimed at examining the effect of psychological capital on innovation performance of the professional technical employees through the angle of knowledge sharing. Based on the hierarchical regression analysis of 347 questionnaires, the study finds that the psychological capital of the employees has a significant positive effect on the innovation performance. Meanwhile, knowledge sharing plays a completely mediating role. The corporation should lay emphasis on the psychological capital and create an atmosphere of learning organization, so as to improve and enhance the innovation performance of employees.