The invention discloses an automatic rotating device for annular glue between a front end cover and snake bone rubber and annular glue between the snake bone rubber and an insertion tube after assembly of an insertion section of an endoscope. The automatic rotating device comprises a rectangular frame made of profiles, a main support and auxiliary supports are installed on the frame, a rotating driving device and a clamping fixing device are installed on the main support to clamp the insertion section and drive the insertion section to rotate, and pressing plates and bearings are installed onthe auxiliary supports to provide auxiliary supporting for the insertion section. Thus, the insertion section is driven by the rotating device to rotate automatically at a constant speed, the insertion section is supported to keep rotating in an approximately horizontal line state, and thus the medical epoxy glue can level itself in the solidifying process to form annular fixing.