Gas stripping device and sewage treatment equipment

The utility model discloses a gas stripping device and sewage treatment equipment, the gas stripping device comprises a diversion pipe, a gas collecting hood, a drainage pipe and a reducing part, the gas collecting hood is used for collecting tail gas generated by an aeration device, the first end of the drainage pipe is used for communicating with the gas collecting hood, the second end of the drainage pipe is used for communicating with the diversion pipe, and the reducing part is connected with the outlet end of the diversion pipe. The variable-diameter part is provided with a small-diameter pipe section, the pipe diameter of the small-diameter pipe section is smaller than that of the flow guide pipe, and the drainage pipe is used for introducing tail gas generated by the aeration device into the flow guide pipe, so that negative pressure is formed in the flow guide pipe, and sludge mixed liquid is sucked to flow from the inlet end of the flow guide pipe to the outlet end of the flow guide pipe. The gas st