The utility model provides a pipeline scale -removing device for place to be connected in the pipeline of heat exchanger and with the power and get rid of with the dirt layer on the inner wall to thepipeline, include: the fixing base is cylindrically, the scale removal unit sets up and serves at one of fixing base, and a plurality of walking unit, fixed mounting is on the edge of fixing base respectively, a length direction removes for driving fixing base along fixing base, wherein, the scale removal unit includes a plurality of scraper subassemblies, knife rest dish and scale removal motor,a plurality of scraper subassemblies are installed respectively on the edge of knife rest dish, the knife rest dish sets up on the fixing base, and rotate for the circumferencial direction of fixing base along the fixing base, the scale removal motor is used for driving the knife rest commentaries on classics of spiraling, the fixed setting on the fixing base, knife rest dish fixed mounting is inthe pivot of scale removal motor, walking unit includes guide roller, gyro wheel seat, conical gear is vice and the walking motor, the scraper subassembly includes cutter, cutter positioning guide pipe, elastic component and cutter position casing.