Self-locking structure for pressure measuring instrument

The utility model discloses a self-locking structure for a pressure measuring instrument, which belongs to the technical field of pressure measuring instruments and comprises a pressure measuring instrument body, a sealing assembly, a sealing driving assembly and a self-locking fixing assembly. The sealing assembly is arranged at the detection end of the pressure measuring instrument body in a sleeving mode and provided with an annular sealing face arranged around the detection end of the pressure measuring instrument body, and the annular sealing face is used for being attached to pipe openings of detected pipelines of different specifications in use so as to seal the detected pipelines; the driving end of the sealing driving assembly is connected with the sealing assembly and is used for driving the annular sealing surface to move towards one end close to the detected pipeline until the annular sealing surface is tightly attached to the pipe orifice of the detected pipeline during use; the self-locking fixi