Clinical expansion device and method for anorectum

The invention relates to the technical field of medical instruments, and discloses an anorectal clinical dilation device which comprises an annular shell, a plurality of threaded sleeves are fixedly connected to the outer wall of the annular shell, dilation rods penetrating through the annular shell are in threaded connection with the interiors of the threaded sleeves, each dilation rod comprises a threaded rod, an elbow and a pull rod, and the threaded rods are in threaded connection with the interiors of the threaded sleeves; the threaded rod is arranged in the annular shell in a penetrating mode, one end of the threaded rod is arranged in an inner hole of the annular shell in a penetrating mode and is rotationally connected with one end of the elbow, and the upper end of the pull rod is connected with the other end of the elbow. The multiple pull rods can be inserted into the anus after getting close to one another, friction between the pull rods and the anus of a patient during insertion can be reduced, t