The utility model relates to a gas and liquid mixing device for dissolving a water-insoluble gas, which mainly comprises a buffer tank having a closed shape, an outlet pipe is arranged in the buffer tank, and a pressure reducing valve is arranged on the outlet pipe, and the buffer tank is provided A pump is connected, the pump is connected to the inlet pipe, and a type of venturi is connected between the inlet pipe and the buffer tank. The pump system is used for pumping water from the inlet pipe into the buffer tank, and then using the pressure difference between the high torque of the pump and the pressure reducing valve to introduce the gas from the venturi-like tube, so that the gas and the water are thoroughly mixed. The gas which is hardly soluble in water is fully dissolved in water, and the balance of the buffer tank, the venturi-like tube and the pressure reducing valve is utilized to prevent cavitation of the pump.一種用於溶入難溶於水氣體之氣、液混合裝置，主要係包含密閉狀之緩衝槽，於該緩衝槽設有一出水管，並於該出水管設有一減壓閥，該緩衝槽係連接一幫浦，由幫浦連接於進水管，且於該進水管與緩衝槽之間連接一類文氏管。其中，該幫浦係供將水由進水管抽入再進入緩衝槽，進而利用幫浦的高扭力與減壓閥的壓差，將氣體由類文氏管導入，使氣體與水得以充分混合，達到將難溶於水之氣體充分溶於水中，且利用緩衝槽、類文氏管及減壓閥的平衡，以防止幫浦產生空蝕現象。
