The invention relates to a ride-hanging type traveling mechanism for a welding machine. The ride-hanging type traveling mechanism comprises a rack, a first traveling wheel and a second traveling wheel, wherein the rack is used for loading and limiting all components, and the first traveling wheel and the second traveling wheel run on a device to be welded. The ride-hanging type walking mechanism is characterized in that the first traveling wheel and the second traveling wheel are both H-shaped wheels, and the first traveling wheel is connected on a first connection rod, and the second traveling wheel is connected with a second connection rod. The first connection rod and the second connection rod are hinged with a connection piece which is arranged on an adjustment rod and can move along the length direction of the adjustment rod. The adjustment rod is arranged on the rack. Compared with the prior art, a traveling mechanism is in a four-hinge mode adjustment rod structure, and the problem that the traveling wheels run centripetally on different radians and an inner opening and outer opening of a round workpiece is effectively solved. Two wheels can be adjusted synchronously through the adjustment rod, and the ride-hanging type traveling mechanism can be ride-hung on the cylinder wall of a cylinder and runs freely.