The utility model discloses a pipeline dredging device belongs to dredge technical field. The problem of current pipeline dredging device to cross curved ability poor is solved. The utility model discloses a spring and casing, the inside cavity that is of casing, the eccentric position of shell backend sets up the crank, and the shell backend center sets up the spring holder, and spring one end is coiled on the spring holder, and the spring other end stretches out casing front end open end, and the front end open end of casing sets up the locking device of spring, and the front end of spring is the drag spring, and the casing is detachable design. The utility model discloses stretch into pipeline to turn or jam department to the spring as far as possible, rotatory crank pushes down again, makes the spring pass through the bend, crosses curved ability reinforce.