An oil well wellhead blowout preventer and system

The invention relates to the field of oil field production equipment, in particular to an oil well wellhead blowout preventer and an oil well wellhead blowout preventer system. The wellhead blowout preventer of the oil well includes a shell part and monitoring equipment. The bottom of the shell part is provided with a first through hole, and the top is provided with a second through hole, which are used for the passage of the pipeline connected with the wellhead blowout preventer of the oil well; The bottom of the part forms a first sleeve part with a return hole inside the first through hole; the monitoring equipment is arranged in the wellhead blowout preventer of the oil well, and is used to monitor the change of the fluid in the shell part and feed it back to the control device. The invention can fully ensure that no landing oil is generated within its effective load range, and control the mis-emission of harmful gases. It not only reduces the loss of landing oil and improves the overall oil production, but also avoids the generation of landing oil, and controls the overall monitoring and processing capabilities of harmful gas emissions, significantly improving the comprehensive pre-control of potential safety hazards. The operation data information of each oil well is collected in real time during operation. Provide rich data detail support for optimization operations.