The connector of the superconducting cable is one of the main factors affecting the life of the cable, in order to study the influence of the defects caused by the intermediate joints in the manufacturing and construction process on high-temperature superconducting cables.Therefore, based on the numerical calculation and analysis of electric field, the finite element method is used to simulate different defects and analyze the influence of three typical construction defects on the electric field distribution in the joint, such as the scratch of insulation layer, the impurity of insulation layer and the welding burr of superconducting tape.The result shows that the maximum electric field intensity decreases with the increase of air gap thickness when there is air gap caused by scratch of the insulating layer.When the insulating layer has the impurities, the electric field distortion around the impurities is the most serious.The tape welding position and the size of burr have great influence on the field intensity of the welded area.The three defect structure parameters have a great influence on the maximum field strength around the defect, and the structural parameter changes will cause a large change in the field strength.The research results can guide the construction process of the superconducting cable intermediate joint.