Gas well mouth flow monitoring device

The invention belongs to the technical field of detection, and particularly relates to a gas well wellhead flow monitoring device which comprises an insertion main cylinder, a regulation and control device is slidably connected to the middle of an inner cavity of the insertion main cylinder, a flow meter is fixedly connected to the top of the inner wall of the insertion main cylinder, and a top end component is fixedly connected to the top of the insertion main cylinder. An air extractor is fixedly connected to the axis of the inner wall of the top end component and fixedly connected with a bent through pipe through an air inlet. According to the device, flow monitoring work can be conducted on fuel gas pumped out of a well opening through an internal flow meter, the actual gas pumping effect of the gas pumping device can be quantitatively controlled through a regulating and controlling device in the middle, and an elastic disc does not need to use an external covering object to block a through opening; the a