Diffraction optical waveguide and augmented reality display device

The embodiment of the invention discloses a diffractive optical waveguide and augmented reality display equipment. The diffraction optical waveguide comprises a waveguide substrate and a mesh grating array, wherein the waveguide substrate comprises a coupled-in grating area and a coupled-out grating area; the mesh grating array is located in a coupled-out grating area of the waveguide substrate; the mesh grating array comprises a plurality of main body gratings and connecting structures for connecting the adjacent main body gratings, the plurality of main body gratings are respectively arranged in an array along a first direction and a second direction, and the first direction and the second direction are parallel to the plane where the waveguide substrate is located and intersect with each other. The problems that an existing diffraction optical waveguide is poor in overall display uniformity, large in thickness and small in coupling-out size are solved, the overall display uniformity of the diffraction opti