Comprehensive milling machine: a milling head body configured to rotate an axis; and cutting edges placed on an outer periphery of a front section of the milling head body, where a mounting hole is formed in a central area of the milling head body, the mounting hole penetrates the milling head body along the axis,an opening area open at the front end of the milling head, a housing area intended to accommodate a head area of a head screw on the back of the opening area, and an interior winding area with threads on the inner periphery in which the mounting hole is formed,an internal diameter of the opening area is less than an internal diameter of the housing area and an external diameter of the head area,a mounting part comprising a threaded ochre area in an outer peripheral area is mounted on the threaded ochre area, with the bolt threading area configured to be screwed into the interior threading area, and a passage hole in the mounting part is formed, with the passage hole configured as follows, the threading area of the head screw shall be inserted in a condition where the head area is located in the housing area and has a smaller internal diameter than the head area.
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