The invention discloses an intelligent nondestructive testing device for spray welding of a pipe row. The intelligent nondestructive testing device comprises a water storage tank, a trolley, a permeation mechanism, a developing mechanism, a first spray head and a second spray head, wherein the water storage tank is used for storing the pipe row to be detected; the trolley can do reciprocating motion relative to the water storage tank and is provided with a control mechanism and two movable sliding tables connected with the control mechanism; the two movable sliding tables are mounted on the outer walls of the two sides of the water storage tank correspondingly; the permeation mechanism is used for spraying a penetrant to the pipe row; the developing mechanism is used for spraying a developing agent to the pipe row; the first spray head is used for cleaning the pipe row; the second spray head is used for air-drying the pipe row; and the permeation mechanism, the developing mechanism, the first spray head and the second spray head are all arranged on the trolley and connected with the control mechanism. Compared with the traditional technology, the intelligent nondestructive testingdevice is reasonable in design, manual operation is not needed, intelligent automatic detection in the whole process can be achieved, a more optimized detection environment is created for the pipe row, the detection efficiency of the industrial pipe row is improved, and the detection precision of the industrial pipe row is also improved.