Arc surface milling assistant processing device

An arc surface milling assistant processing device, comprising:

• a worktable having a work surface, a bottom surface opposite to the work surface, and a mounting end, the work surface defining a concave wedge-shaped receiving space adjacent to the mounting end, thereby forming a milling opening communicating with the work surface and the mounting end;
• a base assembled adjacent to and connecting with the mounting end of the worktable;
• a backup plate adjustably mounted on the base and positioned adjacent to the worktable, thereby forming a tool assembling space together with the base and the worktable;
• and
• a fine adjusting assembly adjustably mounted to the base and resisting against the backup plate, to adjust the position of the backup plate relative to the base and the worktable.