The invention discloses a long oil and gas pipeline total defect combined ultrasonic array nondestructive scanning method, comprising a method used for performing array scanning on structural layout of a combined ultrasonic probe device and a quantification method for all the types of defects, wherein the method used for performing the array scanning on the structural layout of the combined ultrasonic probe device and the quantification method for all the types of defects realize detection and quantification on air holes and inclusions inside a pipe wall, circumferential defects parallel to apipe axis, corrosion conditions of the inner wall and the outer wall of a pipeline and radial and axial crack defects inside the pipe wall. The method disclosed by the invention realizes the detectionand quantification on the air holes and inclusions inside the pipe wall, the circumferential defects parallel to the pipe axis, the corrosion conditions of the inner wall and the outer wall of the pipeline and radial and axial crack defects inside the pipe wall.