Angle fixing device and application method thereof

The invention relates to an angle fixing device and an application method thereof; the angle fixing device comprises a first connecting portion, a second connecting portion and a fixing structure; one end of the first connecting portion is hinged to one end of the second connecting portion, so the first and second connection portions can mutually rotate; the fixing structure is respectively connected with the first and second connecting portions, and used for fixing the positions of the first and second connecting portions. The angle fixing device is simple in structure, convenient to adjust, and fixes stably.