Triangular support inner stop milling fixture

The utility model discloses a triangular support inner stop milling fixture. The triangular support inner stop milling fixture comprises a rear positioning plate (2), a bottom positioning plate (4), a side stop plate (5) and two fixed angle sloping plates (3), the rear positioning plate (2) and the side stop plate (5) are perpendicularly disposed and are welded together through the bottom positioning plate (4), a threaded hole (6) for fixing a workpiece is arranged in the middle of the rear positioning plate (2), each fixed angle sloping plate (3) is in the shape of a right trapezoid, the two fixed angle sloping plates (3) are parallel to the rear positioning plate (2), one side of each fixed angle sloping plate (3) faces the side stop plate (5), the right-angle side of each fixed angle sloping plate (3) is perpendicularly welded with the bottom positioning plate (4), and a plurality of positioning grooves are arranged on two sides of the bottom positioning plate (4) respectively. The triangular support inner