Negative pressure double-shell bottle device

The utility model relates to a negative pressure double-shell bottle device which comprises a hard shell, a soft shell, a threaded opening, an air cavity, a negative pressure cavity, a cutting line and an air inlet, and the hard shell is provided with a hard shell threaded opening, a hard shell wall and a hard shell fusion line; the soft shell is provided with a soft shell threaded opening and a soft shell fusion line; the hard shell and the soft shell are fixedly connected through fusion and are cut along a cutting line to form the double-shell bottle; the hard shell threaded opening and the soft shell threaded opening are combined into a threaded opening through hot melting and fixed connection; the hard shell fusion line and the soft shell fusion line are fixedly connected through hot fusion to form a cutting line; cutting along a cutting line to form an air inlet; the hard shell and the soft shell are fixedly connected through fusion to form an air cavity and a negative pressure cavity. According to the u