Oil well mouth fast connecting device without production halts

An oil well mouth fast connecting device without production halts comprises a connector, a central pipe, an external pipe, a pressure sensor, a temperature sensor, a movable butt joint pipe, packing, a gland, a pressing cap, an adjusting threaded sleeve, an oil inlet valve, an oil return pipeline, an oil return valve and an anti-theft box. The central pipe is in internal threaded connection with the center of the connector, the outer pipe is in internal threaded connection with the right end of the connector, the pressure sensor, the temperature sensor and the oil return pipeline are arranged in the middle of the external pipe, the oil return pipeline is connected with the oil return valve, the movable butt joint pipe is connected with the oil inlet valve through an elbow, a straight pipe section of the movable butt joint pipe penetrates through a central hole of the packing, a central hole of the gland and a central hole of the pressing cap, is in threaded connection with the adjusting threaded sleeve and is inserted into the external pipe, and the pressing cap is in treaded connection with the right end of the external pipe to tightly press the packing. The oil well mouth fast connecting device without production halts is suitable for regular output calibration in oil fields, hot oil circulation and other work on oil wells, the wells do not need to be halted, operation is convenient, sand jamming and well laying caused by sand flow well output calibration is prevented, operation cost is lowered, oil well crude oil output is increased, and the labor intensity of workers is relieved.