Rotary self-lock catch

A rotary self-lock catch, comprising:

• a gasket fixedly arranged on an article needed to tighten a cotton rope, an upper end being provided with a mounting cavity and a side wall of the mounting cavity being provided with a rope penetrating opening;
• an arresting disc mounted in the mounting cavity in an aligned manner, limited with the mounting cavity to be prevented from rotating, a periphery of an upper end being provided with at least one elastic buckle, a tail end thereof extending along a same rotating direction, and an outer side of the tail end of the elastic buckle being provided with a first latch inclining equal to the extending direction of the elastic buckle;
• a screw cap being buckled to the arresting disc and capable of rotating relative to the arresting disc, a middle portion of an inner cavity being provided with an abutting convex column and a side wall being provided with a second latch matched with the first latch, and a top end of the abutting convex column being provided with a third latch;
• and
• a take-up reel placed in the mounting cavity, located under the arresting disc and located on a side surface of the take-up reel to form a take-up cavity, an inner wall of the take-up cavity being provided with a through hole, the other end of the through hole being provided with a hollowed cavity, at least one spring being arranged between the bottom of the take-up reel and the mounting cavity, the take-up reel having a tendency of bouncing outwards under an action of the spring, the upper end of the take-up disc being provided with a pressing convex column and a fourth latch matched with the third latch, and under the action of the spring, a top end of the pressing convex column being placed outside the screw cap after penetrating through center axes of the arresting disc and the screw cap successively.