Nano-Al2O3 coating was prepared on the surface of H13 steel by nano-composite plating (NCP) and then treated by high power continuous wave CO2 laser. Scanning electron microscope (SEM) was used to observe the surface and cross section morphologies of coating before and after laser treatment. Energy dispersive X-ray spectroscope (EDS) was utilized to analyze elements distribution on the surface of coating before and after laser treatment. X-ray diffractometer (XRD) was employed to analyze the microstructure of coating before and after laser treatment. The changes of micro-hardness and coefficients of friction before and after laser treatment were observed. The results revealed that strengthened coating had good performance such as flat surface, uniform component, fine microstructure and metallurgical bonding with parent metal. Nano-Al2O3 particles were distributed on the surface of strengthened coating uniformly. The micro-hardness of the strengthened coating was 1.5～1.8 times of untreated coating, while its coefficient of friction was about half of untreated coating and one third of parent mental. For the surface of strengthened coating and parent metal, grain-abrasion was dominate, however the NCP Al2O3 coating included grain-abrasion and sticking abrasion.