With the rapid development of traffic and the maintenance needs of Bridges along the highway, the maintenance and reinforcement construction of concrete hollow slab joints is widely used. This paper mainly introduces the practice and application of secondary circulation pressure injection construction technology in the repair and repair construction of concrete hollow slab hinge joint reinforcement through the repair and construction case of Beijing-Hong Kong-Macao Expressway (G4) Leiyang to Yizhang section, which provides reference and guidance for similar reinforcement and repair projects.