Automatic leveling optical tree-angle measuring gauge

The invention discloses an automatic leveling optical tree-measuring angle gauge, which is applied in forest survey. The automatic leveling optical tree-measuring angle gauge is provided with a cylindrical shell, two cylindrical ports are parallel planes forming a front observation window and a back observation window; the lower part of the inner side of the shell is fixedly provided with a wedge-shaped mirror, the cylindrical port on one side of the shell is provided with two cusp-shaped gaps, a connecting line of the two gaps is parallel to the upper plane of the wedge-shaped mirror; the top part of the shell is provided with a through hole, a button is arranged in the through hole, a vertical rod is hanged below the button, a vertical rod positioning plate which is parallel to the upper plane of the wedge-shaped mirror is arranged on the vertical rod, and a spring is arranged on the vertical rod positioning plate. The invention has the advantages of compact structure, small and flexible size, convenient ca