Waist rest movable adjusting structure applied to office chair

A waist rest movable adjusting structure applied to an office chair comprises a backrest frame and a waist rest body located on the front side of the backrest frame, a movable seat is rotationally connected to the backrest frame, an adjusting seat is arranged on the movable seat, one end of the adjusting seat is installed on the movable seat in an up-down sliding mode, and the other end of the adjusting seat is rotationally connected with the back face of the waist rest body; a waist rest locking structure used for fixing the position of the waist rest body after the waist rest body is adjusted is arranged between the movable seat and the adjusting seat. The movable seat, the adjusting seat and the waist rest locking structure are arranged on the backrest frame, so that the height and the angle of the waist rest body can be adjusted, a user can conveniently adjust the position of the waist rest according to actual requirements, and the waist of the user is well supported to meet the requirements of different