Rapid preparation device and preparation method of dissolved gas standard solution

The invention provides a device and a method for rapidly preparing a dissolved gas standard solution, one end of a target gas sample introduction pipe and one end of a gas outlet pipe extend into a saturated solution preparation cavity, and the middle sections of the solution sample introduction pipe and the target gas sample introduction pipe are communicated with each other and are controlled by a first three-way control valve; the saturated solution preparation cavity carries a circulating pump, one end of a solution circulating pipeline extends into the saturated solution preparation cavity and is connected with the circulating pump, the other end of the solution circulating pipeline extends out of the saturated solution preparation cavity and is connected with a water-gas separation device, and the water-gas separation device is connected with an online detection device and an atomization pipeline. The middle section of the atomization pipeline extends to the target solution preparation cavity through a