The invention relates to an argon tungsten-arc welding control device. A direct current welding machine or a TIG (Tungsten Inert Gas) welding machine is electrically connected with a workpiece through a welding ground. The direct current welding machine or the TIG welding machine is electrically connected with a welding gun through a welding cable. At least one argon gas bomb is communicated with at least one input end of an argon gas control device through a pipeline. The output end of the argon gas control device is communicated with the welding gun through a pipeline. The argon gas control device is electrically connected with a control button on the welding gun through a control cable. In the argon gas control device, a first electromagnetic valve coil and a second electromagnetic valve coil in the secondary side of a transformer are connected in parallel; a second switch is a change-over switch; when the second switch is positioned at a B position, the second switch is connected in parallel with the control button; and when the second switch is positioned at an A position, the second switch is connected in series with the control button on a branch circuit of the first electromagnetic valve coil. Compared with a TIG welding argon gas control system, the argon tungsten-arc welding control device has the advantages that the welding quality is improved; and the utilization rate of the argon gas is saved by 2 percent to 28 percent.