Centered folding scissor arm hinge

The utility model discloses a centered folding scissor arm hinge. The centered folding scissor arm hinge comprises a first connecting rod, a second connecting rod, a scissor fork and a supporting short arm, the first connecting rod is used for fixing the whole structure; the shear fork is connected to the two connecting rods in a sliding manner, is formed by hinging a plurality of supporting rods in a crossed manner, is foldable and telescopic, and is used for opening and closing the hinge; the supporting short arm is hinged to the middles of the two connecting rods and used for fixing and supporting the shear fork. The second connecting rod is slidably connected with the scissor fork and used for being connected with loads such as window sashes. According to the center folding scissor arm hinge, the application requirement for a large opening distance can be met when the width size of a window sash is small, meanwhile, due to the fact that a fixed supporting point is in the center, the hinge is even in stres