Gas-liquid mixing device

The utility model discloses a gas-liquid mixing device which comprises a gas supply device, a liquid supply device, a gas collector with a gas cavity, a mixer with a mixing cavity, a constant pressure valve, a feeding pipe, a discharging pipe and a waste discharging pipe, one end of the feeding pipe is communicated with the air cavity, the mixing cavity and the air feeder, the other end of the feeding pipe is communicated with the first connecting pipe, and the first connecting pipe, the first valve body, the second connecting pipe and the waste discharge pipe are communicated; the third connecting pipe, the second valve body, the fourth connecting pipe, the third valve body, the fifth connecting pipe and the air cavity are communicated, and the liquid supply device is communicated with the fourth connecting pipe; the mixing cavity, a sixth connecting pipe, a constant pressure valve, a seventh connecting pipe, a fourth valve body and a discharging pipe are communicated, and the fourth connecting pipe is commu