Tongue-buckling pliers of protection screen packaging box opening tool

The utility model discloses a pair of tongue-buckling pliers of a protection screen packaging box opening tool. Thin steel sheets are respectively welded at the opposite positions capable of being in contact with the front ends of an upper pliers mouth and a lower pliers mouth to form a flat pliers mouth, and an inverted hook is welded on the outer side of the upper pliers mouth nearby the front end of the thin steel sheets. Constructors can outward prize a tongue-shaped lock catch in a strength-saving mode, and operation is simple, accurate, safe and quick. In addition, the tongue-shaped lock catch can be flatly, conveniently and upward bent by utilizing the flat pliers mouth, a basis is provided for the following-up packaging box prizing, the working efficiency is improved, and the personable safety in the dismounting process is also ensured.