A seal cover for sealing a filling tube of a container, includes a cover wall and a cover plate. An outer wall of the filling tube is provided with external threads; the seal cover includes an inner cover body and an outer cover body; the cover wall encloses a barrel structure, with one end sealed by the cover plate, and the other end being an open end; an inner surface of the cover wall is provided with internal threads matched with the external threads of the filling tube; a boss is formed on an end face of the open end of the inner cover body; the filling tube is provided with a wedge block; the external threads of the filling tube and the internal threads of the inner cover body are screwed with each other.