The mill roll laser texturing is the newest mill roll texturing method which has broad application prospects. As the limit of processing method, the distribution of the craters on the surface of the mill roll is anisotropy and periodicity, which makes the surface of the texturing cold-roll steel not satisfy the needs. A fiber laser control method is proprsed to produce random frequency and power lasers. This method can control the fiber laser device output particular wave form laser by the pulse width modulation signal which is calculated by a pseudorandom algorithm. The surface of the mill roll produced by this method is isotropic and irregular which can reach the quality requirements. In addition, it can also improve production efficiency. The laser texturing equipment based on this method is applied in practice and makes well effect.