Automatic locking structure of mechanical rotating shaft

The utility model discloses an automatic locking structure of a mechanical rotating shaft, which relates to the technical field of rotating shafts and comprises a mounting sleeve and a rotating shaft body rotationally arranged in the mounting sleeve. The locking assembly is used for locking the rotation of the rotating shaft body; the locking assembly comprises a pressing rod inserted into the mounting sleeve in a sliding mode and a first locking disc fixedly installed at one end of the rotating shaft body, the end, extending into the mounting sleeve, of the pressing rod is fixedly connected with a mounting base, and a guide rod is fixedly installed on the side, away from the pressing rod, of the mounting base; a second locking disc is fixedly connected to the end, away from the mounting base, of the guide rod, gear rings which can be meshed with each other are arranged on the opposite sides of the first locking disc and the second locking disc correspondingly, a groove is formed in the mounting base, and a s