Pipeline plays an important role in oil and gas transportation. With the increase of service life of pipeline, it is easy to produce various forms of defects. Combined with the field conditions, ANSYS simulation software was used to built a non-destructive natural gas pipeline and a pipeline with internal corrosion defects. By compared the pressure check and stress check conditions, the accuracy of the simulation model was verified. The linear regression model was established to analyze the maximum stress value of the defective pipe under different internal pressure. Subsequently, a smart sleeve repair technology was proposed for the defective pipeline, and a sleeve repair model was established for the defective pipeline. The influence of different epoxy layer thickness on the reinforcing effect of the defective pipeline was studied, the optimal epoxy layer thickness was determined, and experiments and field verification were carried out. The smart sleeve monitoring system was used for real-time strain monitoring of pipeline defects. Based on the collected real-time strain data, the effectiveness of pipeline defect reinforcement was confirmed, which provided a practical application method for the repair of pipeline defects and the evaluation of the effect after repair.