An array of micro-craters was machined on the surface of M35 high-speed steel (HSS) using a 1 030 nm femtosecond laser. The three-dimensional morphology and the contact angle of the samples were measured using an optical microscope, a white light interferometer and a contact angle measurement system. Results show that the sizes and depths of the craters increase with increasing energy density and number of scans. The contact angle of the M35 HSS surface decreases, and the hydrophilicity of the sample surface increases. Reducing the spacing of the craters can improve the hydrophilicity of the M35 HSS surface. These test results can be used as a reference for the study of surface wettability of HSS.