UV ink for steel pipe marking was developed. The influence of prepolymer, monomer and photoinitiator on the UV ink properties such as viscosity, curing speed, adhesion and flexibility were discussed. The optimum formulation of the UV curing ink was as follow: PUA-2 29.8%, AR 37.3%, HDDA 16.10%, YFJ-S 2.20%, dispersant 2.7%, TiO-2 6.4% and defoamer 1.3%. Under the condition of the optimum formulation, the UV curing ink properties were as follow: viscosity 1800mPa•s, curing time 60 s, adhesion level 3 and good ink film flexibility. The UV curing ink is excellent for steel pipe marking.