Gas-liquid balance liquid preparation device capable of synchronously sampling and inflating

The invention discloses a gas-liquid balance liquid preparation device capable of synchronously sampling and inflating, which is provided with a balance cabin body, a feeding valve cylinder, a one-way exhaust valve and a pressure supplementing and sampling structure, the pressure supplementing and sampling structure is provided with an expansion bag body, a sampling valve cabin and a pressure supply valve cabin, and the outer ends of the sampling valve cabin and the pressure supply valve cabin are connected with a synchronous driving part; the synchronous driving part drives to extract gas in the sampling valve cabin and push gas in the pressure supply valve cabin to enter the expansion bag body at the same time, so that the expansion bag body expands to apply pushing force to surrounding gas in the balance cabin body, and gas at the top in the balance cabin body enters the sampling valve cabin under the action of negative pressure and pushing pressure. According to the invention, air exhaust in the sampling