Length-adjustable pipeline brush

The utility model discloses a pipeline brush with an adjustable length, which belongs to the technical field of pipeline brushes and comprises a handle, an adjusting structure is arranged on the handle and comprises a moving block, the moving block is slidably connected onto the handle, a connecting rod is rotatably connected onto the moving block, a cleaning structure is arranged on the connecting rod, and the cleaning structure is connected onto the handle. A fixing structure and a locking structure are arranged on the moving block, and the fixing structure comprises a stress plate; by arranging a handle, an adjusting structure, a fixing structure and a locking structure, after an operator adjusts the distance between a connecting rod and the handle to a proper length, the operator reversely rotates the connecting rod, the connecting rod drives a threaded rod to reversely rotate, an extrusion block moves away from the connecting rod on the surface of the threaded rod, and the extrusion block extrudes a fixi