Abstract: Using ultrasonic vibration assisted MIG welding method, the simulation calculation and process research on5083 aluminum alloy plate with the thickness of 4 mm were carried out. For this process, the finite element analysis software ANSYS Workbench was used to build a model of ultrasonic welding and vibration analysis, simulated the flow of the welding molten pool and the resonant response of the base material under the action of ultrasonic vibration. The simulation results show that the solidification interface of the molten pool after the vibration is smoother and flatter, and the larger liquid surface area is also beneficial for gas escape. An investigation was also conducted into the ultrasonic vibration assisted MIG welding process, with the macroscopic shape, microstructure, and tensile properties of the joint analyzed. The results show that the porosity and central grain size of the joint with ultrasonic vibration are significantly lower than those of the joint without ultrasonic vibration, and the tensile strength can be basically stabilized at 290 MPa or above, which is 15 MPa higher than the required standard; the fracture surface consists of fine and dense ductile pits, with good plastic characteristics; the reason why the ultrasonic vibration-assisted weld seam can be strengthened is mainly due to the refinement of grains and the reduction of porosity.