The invention belongs to the technical field of pipeline detecting equipment, and particularly discloses a pipeline measuring point device. The device comprises a conveying unit for conveying a pipeline, and further comprises a detection unit consisting of a jet pipe and a marking ring, the jet pipe is arranged on a conveying path of the conveying unit, the jet pipe is provided with a jet head, ajet groove is arranged in the circumferential direction of the jet head, and a gas is introduced into the jet pipe; the marking ring is coaxial with the jet pipe, the marking ring is aligned with thejet head, the conveying unit is located in the marking ring, the inner wall of the marking ring is provided with a plurality of piston cylinders which are in the shape of a mountain, each piston cylinder comprises a center port and two edge ports, the center port is internally provided with a center piston, the edge ports are internally provided with edge pistons, the edge ports are provided withelastic seal catches, and the seal catches are provided with cracks; the inner wall of the marking ring is provided with an ink box, the ink box is provided with an ink outlet pipe, and the ink outletpipe communicates with the edge ports. The objective of the invention is to provide a pipeline measuring point device capable of automatic detection and marking of dead pixels.