Digital welding technology has been gradually applied in mechanical manufacturing, automobile and other fields and achieved good results. Based on EN15085 welding system of rail vehicle and the data management of man-machine method, the existing problems of welding quality system are analyzed in this paper. In this paper, the key technologies for establishing the whole life cycle digital welding system are described, and its feasibility and necessity are demonstrated. The results show that the whole life cycle welding management system is suitable for rail transit. It is an inevitable approach to intelligent welding to improve quality management and reduce labor cost.