The utility model provides a submarine pipeline crawling machine tool. The submarine pipeline crawling machine tool comprises an integral frame, a front clamp device, a rear clamp device and a crawling device. According to the working principle, the submarine pipeline crawling machine clamps a pipeline through the self-adaptive centering clamps of the front clamp device and the rear clamp device,and then the submarine pipeline crawling machine crawls on the surface of the pipeline under coordination and cooperation of the front clamp device, the rear clamp device and the crawling device. Thesubmarine pipeline crawling machine tool can carry various underwater operation devices, a platform is provided for the submarine pipeline crawling machine tool so that submarine pipeline operation can be carried out smoothly, and the difference between China and foreign submarine pipeline operation devices in the technical aspect is reduced.