A gun cover with a securing assembly includes a waist plate at an inner side thereof; and an enclosure for defining a gun groove; the enclosure having an inner lateral plate and an outer lateral plate; the inner lateral plate having a through hole for receiving an elastic tenon which protrudes from an interior of the gun groove; the elastic tenon having a press portion; and the press portion being installed between the inner lateral plate and an inner side of the waist plate and projecting out of an upper side of the outer frame.