Abstract: As the core connecting and controlling component of high-pressure manifolds, high-pressure connectors are prone to surface wear and erosion, fatigue crack fracture, surface plastic deformation and other failures under complex service conditions. Carburizing treatment, as an effective surface strengthening process, can significantly alleviate the above defects. In this paper, 15CrNiMo steel high-pressure connectors are taken as the research object. The process matching laws of temperature, time and carbon potential during carburizing and quenching are analyzed. By means of hardness testing, tensile testing, impact testing and microstructural observation, the effects of carburizing and quenching processes on the microstructure and mechanical properties of high-pressure connectors are investigated. The results show that uniform and fine martensitic microstructure can be obtained when the effective case depth ranges from 1.11 mm to 1.22 mm. Under such conditions, the maximum tensile strength reaches 1065 MPa, the maximum yield strength reaches 983 MPa, the maximum elongation is 22%, the maximum reduction of area is 71%, and the maximum impact absorbed energy is up to 138.21 J.