Abstract: A device for measuring the laser facula based on the fiber-scanning was demonstrated. The laser facula was detected by a fiber probe in a progressive scanning way. The light signal was converted, measured and transmitted to computer, then finally plotted by software. A fast scanning measuring scheme was proposed and two important parameters including measurement resolution and time were calculated and analyzed based on the large diameter pulsed laser measurement. A contrast experiment with CCD photographic method was done, and the result shows that this device avoids the effect generated by the scatter of receiving screen or imaging system deviation, it uses a directly measuring way and provides a better measurement result. This device is successfully applied to the measurement of focused beam transmission.