Wellhead pressure automatic control valve for oil and gas production

The invention discloses an oil and gas production wellhead pressure automatic control valve which comprises a control valve body, an oil and gas production wellhead pressure automatic control valve body and an oil and gas production wellhead pressure automatic control valve body. The mechanical pressure sensor is connected with the control valve through different pipelines, the mechanical pressure sensor is used for being connected with fluid in a wellhead, the pipelines communicated with the control valve are switched according to different pressures of the connected fluid, and the control valve is controlled to be opened and closed. The valve has the advantages that the valve can be automatically controlled to be closed and opened only according to the underground pressure, for example, the valve is automatically closed when the underground pressure exceeds the designed pressure, and the valve is automatically opened to recover production operation when the underground pressure is lower than the designed pr