Shale gas low-pressure stage gas lift drainage gas recovery device and implementation method

According to the shale gas low-pressure stage gas lift drainage gas production device and the implementation method, a high-pressure gathering and transportation branch line is newly built to a gas production tree natural gas conveying process pipeline, a gas well wellhead gas production tree is connected with a high-pressure gathering and transportation pipeline, high-pressure natural gas in the high-pressure gathering and transportation pipeline serves as a gas well gas lift gas source, and after flow communication, the gas well gas lift drainage gas production device is connected with a gas well. Natural gas enters a gas well through the high-pressure gathering and transportation pipeline, gas lift liquid drainage of the gas well can be achieved, gas lift can be achieved through the high-pressure gathering and transportation pipeline, power equipment such as a vehicle-mounted gas lift vehicle and a compressor is not needed, and after cost comparison, cost can be greatly saved; the gas lift injection amount