Nitrogen supplementing device for taking oil sample from casing pipe

The utility model relates to a sleeve oil sampling nitrogen supplementing device which comprises a connecting component, a plurality of connecting ports are formed in the connecting component, a plurality of connecting channels communicated with the connecting ports are formed in the connecting component, and the connecting channels are communicated with one another. The connector comprises a sleeve connector used for being connected with a sleeve opening, a nitrogen connector used for inputting nitrogen and an exhaust connector used for exhausting. The nitrogen connecting port is connected with an air inlet pipe, the exhaust connecting port is connected with an exhaust pipe, and a pressure gauge is arranged between the exhaust connecting port and the exhaust pipe. A rotating shaft penetrating through the connecting component is arranged in the connecting component, the rotating shaft is rotationally arranged on the connecting component, one end of the rotating shaft faces and penetrates through the sleeve co