The invention relates to an experimental device for forming jet flow by drifting water with a high-speed airflow and generating supersaturated total dissolved gas, which comprises a water column, a flowmeter, an air compressor, valves, a total dissolved gas determinator, a water pump, a jet pipe, a nozzle and a nozzle hole. The water column is designed into a main water column and an auxiliary water column, the nozzle hole in the wall of the main water column is connected with a rubber hose, a third valve is mounted on the rubber hose and communicated with the auxiliary water column, the air compressor is connected with one end of the flowmeter by a first valve, the other end of the flowmeter is connected with the jet pipe by a three-way pipe, the jet pipe is connected with the nozzle which is arranged in the main water column, the three-way pipe is connected with the water pump by a second valve, the water pump is arranged in the auxiliary water column by a pipeline, a fourth valve is mounted at the bottom of the auxiliary water column, a fifth valve is mounted at the bottom of the main water column, and a probe of the total dissolved gas determinator is inserted in the main water column. The experimental device can be used for simulating the submerged discharge, the free discharge and the total dissolved gas saturation process of different front-dam flows to research the relation between the supersaturation level and the front-dam total dissolved gas saturation.