The invention discloses a cleaning device for valve scaling, comprising a chemical cleaning solution storage tank (1), a delivery pump (2) and a main pipeline (3); a branch pipeline (4) is connected on the main pipeline (3) for delivering the chemical cleaning solution; a control valve (5) is connected on the branch pipeline (4); various valves (7) with different nominal diameters are connected in series by connecting short pipes (6) with variable diameter on the branch pipeline (4); and then the cleaning solution returns to the chemical cleaning solution storage tank (1). Compared with the prior art, the device has the advantages of simple process, thorough cleaning of the valve scaling, and greatly improving the service life of the valve, thus saving spare parts and spare pieces, reducing production cost and the like.