Cutting auxiliary device and cutting equipment for inclined mounting surface

The utility model discloses a cutting auxiliary device and cutting equipment for an inclined mounting surface, and relates to the technical field of mounting equipment. The cutting auxiliary device comprises a fixed sleeve and a movable sleeve which can be arranged on a to-be-cut workpiece in a sleeving mode. A fixing assembly is arranged on the fixing sleeve; the fixed sleeve can be installed ona workpiece to be cut through the fixed assembly, the fixed sleeve and the movable sleeve are rotatably connected, one of the fixed sleeve and the movable sleeve is provided with an angle measuring part, the other one of the fixed sleeve and the movable sleeve is provided with an indicating part, and the angle measuring part can be matched with the indicating part to display the numerical value ofthe relative rotating angle of the movable sleeve and the fixed sleeve. The cutting equipment of the inclined mounting surface adopts the cutting auxiliary device. The cutting auxiliary device is accurate in cutting angle adj