Abstract: In order to solve the problem of laser welding porosity of 5183 aluminum alloy with 6.0mm thickness, laser-weaving welding was carried out by using IPG laser-weaving welding head. The test was carried out by changing scanning mode, scanning frequency, scanning amplitude and so on. The influence of laser-weaving technology on the quality of thick aluminum alloy welding joint was studied, and the optimum process parameters were found and verified. The results show that the appearance of aluminum alloy welds under laser-weaving welding is significantly improved. In addition to the small number of air holes in the linear scanning mode, the porosity of other four scanning modes (clockwise, counter-clockwise, figure 8 and infinity) decreases significantly with the increase of scanning frequency and scanning amplitude. When the scanning frequency is more than 200Hz and scanning amplitude is more than 2.0mm, no porosity weld can be obtained. Aluminum alloy with 6.0mm thickness can be processed as the butt joint with no porosity, tensile strength of 271MPa and base metal strength of 88%, under the best process parameters of scanning mode infinity, scanning frequency of 300Hz, scanning amplitude of 3.0mm. The laser-weaving welding shows a good prospect.