Controllable variable-diameter pipe scraper

The invention relates to a controllable variable-diameter pipe scraper, and belongs to the technical field of downhole pipe cleaning tools. The pipe scraper is composed of a core pipe, an outer shell,a sectioning scraper and a control oil cylinder, wherein the outer shell is installed on the circumference of the core pipe in a threaded mode, the sectioning scraper is installed on the outer side of one end of the outer shell, the control oil cylinder is installed at the other end of the outer shell, and the control oil cylinder is movably connected with a supporting mechanism through a connecting rod. According to the pipe scraper, the diameter of a scraping pipe can be consistent with the diameter of a shaft, so that shafts with different diameters can be cleaned without replacing the pipe scraper, and therefore the working efficiency can be greatly improved, and meanwhile, the shaft can be cleaned up without damaging the inner wall of the shaft; and the working stability of the sectioning scraper in the rota