The invention discloses an automatic clamping and mounting mechanism of a mattress surrounding edge rim. The automatic clamping and mounting mechanism comprises a working table and a movable frame, wherein five groups of fixed frames are mounted at the upper end part of the working table in an equal spacing manner; the middle position at the bottom of the back surface of the working table is fixedly connected with a support; a motor is erected on the support; an output shaft of the motor penetrates through interior of the working table, and extends towards the front end, so as to be rotatablyconnected with an operation gear. The automatic clamping and mounting mechanism of the mattress surrounding edge rim, disclosed by the invention, provides a motion structure for regular motion of a similar robot; the operation gear meshes with an elliptical inner tooth ring, and the elliptical inner tooth ring is caused to do a similarly elliptical reciprocating motion to drive a lower clamping mechanism to move synchronously to meet the requirement of displacement in a mattress rim mounting process; furthermore, the automatic clamping and mounting mechanism is fully automatic; the problems oftime consumption and labor consumption of manual operation due to an extremely large volume of the surrounding edge rim are solved; the automatic clamping and mounting mechanism is applicable to different working conditions, and brings a better use prospect.