Laser texturing has many advantages in the current micro-texturing, but most of the researches are about the formation of micro-concave. In this paper, nanosecond fiber laser was used to create micro-concave/convex texture on the surface of 304 stainless steel. The effect of laser processing parameters on the surface morphology of micro-concave/convex texture was studied. The results show that with the increase of power, the central bulge height of the micro-texture firstly increases, then decreases and finally turns into a pit. At laser power of 25 W, the height increases firstly and then decreases with the pulse width increases, while at laser power of 30 W and 35 W, the height decreases firstly and then increases and then decreases. At laser power of 20 W, with the increase of pulse width, the pulse width firstly decreases, then increases, then decreases, and the variation range is small. At laser power of 40 W, the bulge disappear. The diameter of texture increases with the increase of laser power and pulse width. With the increase of the number of pulses, the concave depth at the central bulge of the micro-convex texture also increases, the height of micro-convex texture decreases. When the number of pulses is 1, the laser power is 25 W and the pulse width is 10 000 ns, the micro-protrusion texture with the height of 35.362 μm, and the diameter of 174.057 μm can be obtained.