The invention disclosesa tubular productsurface treatment process. Raw materials including 25-35% of Al2O3, 10-25% of TiO2wt and the balance Cr2O3 by weight are weighed respectively; a ceramic coating mixed raw material is obtained through ball milling after mixture; after the surface of a water delivery pipe is treated, the ceramic coating mixed raw material is spayed to the outer surface of the water delivery pipe, wherein the weight of the mixed raw material per unit area on the water delivery pipe is 130-400 g/m<2>. The composite-layer water delivery pipe prepared by adopting the method can be effectively prevented from oxidized underground or in the air in use, accordingly the internal centrifugal water delivery pipe is protected against oxidization, and a preservative effect is played. The treating process is simple, convenient and feasible and good in preservative effect. A high-molecular polymer layer on an inner surface can effectively ensure safe and pollution-free delivery of various types of transportation liquid. The tubular productsurface treatment process can be widely used in multiple technical fields of transportation of various types of liquid.