Filter element device capable of automatically locking water

The utility model relates to the technical field of sanitary napkin design, and discloses a filter element device capable of automatically locking water, which comprises a sanitary napkin body, a placing groove is arranged in the middle of the top end of the sanitary napkin body, a containing bag is arranged on the inner wall of the placing groove, and the shape of the outer wall of the containing bag is matched with that of the inner wall of the placing groove. Water locking cotton cloth is arranged on the inner wall of the top end of the containing bag, and second hook-and-loop fasteners are fixedly connected to the front and rear sides of the outer walls of the left and right ends of the containing bag. According to the utility model, the accommodating bag and the permeable covering cotton are arranged, so that the water-locking cotton cloth can be placed in the accommodating bag, then the accommodating bag and the water-locking cotton cloth are placed in the placing groove, the second magic tapes on the t