Oil sleeve joint sealing and detecting device

The invention discloses an oil sleeve joint sealing and detecting device, which comprises an external pressure container and an auxiliary extension rod; sealing plugs are arranged at two ends of the external pressure container and used for sealing the ends of the external pressure container; the auxiliary extension rod is used for being connected at two ends of a test sample; an internal pressure leakage rate detection device is arranged in the external pressure container; the device is used for detecting whether the test sample is leaked and a leakage condition; a third channel, a second channel and a first channel are arranged on the external pressure container; the third channel is used for being connected to an external pressure sensor; the second channel is used for being connected to a pressure pipeline to apply external pressure; a data wire of the internal pressure leakage rate detection device is arranged in the first channel; the data wire is connected to a pressure display; a second through hole and a first through hole are arranged on the auxiliary extension rod; the second through hole is used for being connected to an internal pressure measuring sensor; and the first through hole is used for being connected to the pressure pipeline to apply internal pressure. A joint is detected by adopting the device disclosed by the invention, thus, the sealing reliability of a pneumatic sealing joint for underground application is increased.