In order to optimize the process parameters of laser preparation of surface micro-pit texture and improve the tribological performance of cylinder liner-piston ring friction pair, nanosecond pulse laser was used to prepare elliptical micro-pit texture on the surface of chrome-plated piston ring, which explored the influence of laser power, processing times, scanning speed and filling line spacing on the morphology and size of the micro-pits. The results show that increasing the laser power and repetitive processing times, reducing the scanning speed and filling line spacing can effectively increase the depth of the micro-pits. The length of the micro-pit length decreases with the increase of laser power, and it first increases and then decreases with the increase of processing times. The scanning speed and the spacing of the filling lines have a low influence on the length of the micro-pit length. When the processing parameters are laser power 9 W, repeated scanning three times, scanning speed 200 mm/s, filling line spacing 1 μm, and laser repetition frequency 30 kHz, a target with a long radius of 200 μm, a short radius of 150 μm and a depth of 38 μm can be machined on the surface of the chrome-plated piston ring micro-pits. The research results provide guidance for the practical application of laser preparation of micro-pit texture on the surface of piston ring and improvement of tribological properties of friction pairs.