The utility model relates to an oil drill pipe magneto-acoustic emission detector which is used for detecting the damage and residual stress of the oil drill pipe body and providing the basis for the rating of the drill pipe. The oil drill pipe magneto-acoustic emission detector comprises handles (1), a spring (2), a drill pipe body (4), a connecting arm (3) and a sensor box (5); wherein, the sensor box (5) is arranged at the top of the middle arc of the device, a connecting arm (3) is arranged at both sides of the sensor box (5), the handle (1) is arranged at the top end of the connecting arm (3), and the spring (2) is arranged between the sensor box (5) and the connecting arm (3). The oil drill pipe magneto-acoustic emission detector can detect the residual stress and the micro damage degree of the drill pipe, and can accurately position the defect.