Abstract: To study the influence of different laser processing parameters on the surface hydrophobicity of the micro grooves etched by an ultraviolet picosecond laser on the surface of a soaking plate, a Cassie-Baxter model were constructed. By using the method of single factor experiment, the change rate of laser scanning, laser scanning spacing, speckle transverse overlapping times was experimentally verified, respectively. The results show that the hydrophobicity of the surface of micro-grooves can be improved by reducing the ratio of solid-liquid area and the width of the grooves or shortening the distance between the grooves. The main reasons for the surface hydrophobicity of micro-grooves are the internal micro-nano structure and the adsorbed hydrophobic chemical groups during processing. When the laser scanning rate is 125mm/s, the laser scanning interval is 200μm, and the spots overlap twice, the surface of the micro-grooves etched by ultraviolet picosecond laser has the strongest hydrophobicity. This study provides a reference for enhancing the hydrophobic performance of the condensing end of the soaking plate and improving its over all circulation efficiency.