A depth of field adjustment method for a binocular see-through AR head-mounted display device includes steps of: obtaining a distance dis between a target object and human eyes (204); making a distance Ln between a virtual image formed by effective display information through optical systems and the human eyes (204) equivalent to the distance dis between the target object and the human eyes (204); according to the distance Ln between the virtual image and the human eyes (204) and a preset distance mapping relationship δ, obtaining an equivalent center distance dn between left and right groups of the effective display information; and according to the equivalent center distance dn, displaying information source images required to be displayed of virtual information respectively on left and right image display sources (201a, 201b). A binocular see-through AR head-mounted display device is further provided.