Sinusoidal surface texture can effectively improve surface friction performance and coating adhesion performance, to clarify the effects of laser processing parameters on the formability of sinusoidal microtexture, nanosecond lasers were used for texture preparation on 40Cr steel. The structural parameters and forming quality of the sinusoidal texture were characterized using three-dimensional morphometers, SEM, etc. And then, the effects of laser power, scanning speed, pulse frequency, and scanning repetition times on the forming regularity of sinusoidal texture were analyzed. Results show that the structural parameters of the sinusoidal texture increase with higher laser power, pulse frequency, and scanning repetition times, or with lower laser scanning speeds. At the peaks and valleys of the sinusoidal texture, the inner side bulges are larger than those on the outside. To prevent the sinusoidal texture from becoming discrete dimples, the scanning speed should not surpass 1000 mm/s. Maintaining the pulse frequency between 15 kHz and 65 kHz, and adjusting the number of laser scanning repetitions from 3 to 13, can prevent the sinusoidal texture from being blocked by sputtered metal or forming too shallow.