The utility model belongs to disc spring technical field especially is a kind of thread fastening disc spring of anti-loosening, including the disc spring main part by the stacking of multiple elastic units, further include: support disc;Mounting column, the mounting column is through the disc spring main part, the outer wall of the mounting column is fixed with multiple limit convex strip that distributes evenly along the circumference, the disc spring main part is in and is equipped with the first clamping groove compatible with the limit convex strip;Movable disc, the movable disc is located the top of the disc spring main part;Limit disc;And the locking bolt that is through the limit disc and is with the thread hole thread cooperation;In the utility model, by the cooperation of limit convex strip and clamping groove, the rotation of disc spring main part is limited, solves the loosening problem under high-frequency vibration, improves stability and buffering performance;Disc spring main part uses the cooperation of support disc, mounting column, movable disc, limit disc and locking bolt to realize installation, and installation is convenient, and stability is high.