Milling machine fixture angle adjusting device and milling machine fixture

The invention belongs to the technical field of workpiece clamping devices, and particularly relates to a milling jig angle adjusting device and a milling jig. The milling jig angle adjusting device comprises an angle adjusting assembly, the milling jig is installed at the top end of the angle adjusting assembly, the angle adjusting assembly comprises a connecting plate, and an inner gear ring is rotationally and slidably connected to the top end of the connecting plate; the left side and the right side of the inner gear ring extend out of the connecting plate, the top end of the inner gear ring is fixedly connected with a milling machine clamp, and a bottom plate is hinged to the front end of the connecting plate. Through the arrangement of the angle adjusting assembly, the connecting plate is installed below the clamp and slidably connected with the bottom plate through the supporting plate, the inclination angle of the clamp is adjusted through front-back movement of the lower end of the supporting plate,