Plug-in thermal gas mass flow meter

The utility model discloses a plug-in thermal gas mass flow meter, which relates to the technical field of gas mass flow meters, and comprises a pipeline, a flow meter is connected onto the pipeline, the flow meter penetrates through a mounting port and a hole to be plugged on a sealing element, a fixing mechanism is arranged on the sealing element, and the fixing mechanism is connected with the flow meter. Through the fixing ring arranged on the outer wall of the flow meter, after the inner diameter of a pipeline is confirmed, the position of the fixing ring is adjusted, an inductive probe of the flow meter is located on the upper portion of the axis of the inner diameter of the pipeline, then the jackscrew is rotated, the jackscrew moves inwards and ejects the sealing ring, and therefore the position of the fixing ring is fixed; during installation, a tool is used for rotating an adjusting rod in an adjusting hole, the adjusting rod pushes telescopic plates to move oppositely and abut against the top face o