The invention discloses a method for improving the gloss of pipes. Firstly, a solution is heated to the temperature of 50-60 DEG C. Secondly, pure cotton cloth is soaked in the solution, and a core opening mould is covered with the pure cotton cloth. At the temperature, on the one hand, the solution can be promoted to soak into the metal surface of the core opening mould stably; on the other hand, the solution is prevented from evaporating too soon. The metal surface of the core opening mould can be sufficiently soaked in the solution in the environment at the temperature of 35-40 DEG C after 40-60 min. Finally, the metal surface of the core opening mould is coated with the solution evenly, and then the core opening mould is put in an oven at the temperature of 90-120 DEG C. At the temperature, high-strength chemical bonds can be effectively promoted to form on the contact surface when the solution makes contact with the metal surface of the core opening mould, and the solution is firmly attached to the core opening mould and does not fall off. By means of the scheme, the problems of high roughness and low gloss of pipes in the prior art are solved, and the problems of complex operation and low production efficiency due to the fact that corresponding core opening moulds need to be replaced according to the different models of pipes to be produced are solved.