Abstract: In order to reveal the distribution and technological rule of temperature field during laser cutting of 6061 aluminum alloy sheet by scanning speed, the temperature field of 2 mm thick aluminum alloy sheet under different laser cutting speed was simulated by finite element software, and the simulation results were verified by experiments. The simulation results show that when the laser cutting speed is 80 mm/s, the heat affected zone of the workpiece is wide and the melting depth is large, and the materials in a wide range of the slit have reached the melting point temperature. With the increase of the cutting speed, the width of the heat affected zone, the melting amount and the melting depth of the material in the slit gradually decrease. When the cutting speed is 120 mm/s, the melting depth of the workpiece just reaches the thickness of the material. The experimental results show that when the cutting speed is too low, the material melting amount at the slit is too much, and thick hanging slag is formed at the bottom. With the increase of the cutting speed, the quality of the slit is effectively improved, but if the cutting speed is too large, the material melting amount at the slit is reduced, and the roughness is increased. The cutting speed is 120 mm/s, and the quality of the slit is the best. The experimental results are in good agreement with the simulation results, which proves the accuracy of simulation results.