UV LED has incomparable advantages than traditional mercury lamp. It is with high power UV LED lamp beads packaging, integrated operational control and cooling system of rapid refrigeration cycle. After successful replacement of tradition mercury lamp (or metal halide lamp) by UV LED system on label rotary printing machine, it can save more than 80% energy and electricity, and achieve stable and evenly light energy output. The production efficiency is greatly improved since it can open and work instantly without preheating.