Disclosed is a device capable of cleaning the outer wall of a nodular cast iron pipe or pipe mold. The device comprises at least two supporting wheels, a support, a rail, a trolley and a laser cleaning machine; the rail is arranged above the support, the at least two supporting wheels are mounted under the rail, the nodular cast iron pipe or pipe mold is placed on at least two supporting wheels, the trolley is arranged on the rail, and can walk on the rail, the laser cleaning machine is arranged on the trolley, and the laser cleaning machine is aligned at the outer wall of the nodular cast iron pipe or pipe mold to emit lasers. According to the device, in the production process of the nodular cast iron pipe, due to rust removal of the outer wall of the nodular cast iron pipe or descaling of the outer wall of the pipe mold, quick-wear part consumption is reduced, the wear of other descaling and rust removal manners to the outer wall of the nodular cast iron pipe or pipe mold is completely eradicated, the quality of nodular cast iron pip finished products can be improved, and the cleaning device can be used for carrying out rust removal treatment on the nodular cast iron pipe, and also can be used for descaling treatment of the pipe mold.