The invention provides a rotary positioning machining rotary table comprising an angle base. The slope angle of the angle base is equal to an included angle between a bus and an axis of a machined conical cabin segment; the angle base is provided with a rotating disk bottom plate; after a rotating disk is connected with a rotating shaft, the rotating disk is installed on the rotating disk bottom plate through a thrust bearing; a bottom plate stepped hole for installing the thrust bearing is formed in the center portion of the rotating disk bottom plate; evenly-distributed bottom plate locking screw holes are formed in the periphery of the rotating disk bottom plate; positioning holes are further formed in the peripheral line of the rotating disk bottom plate; rotating disk stepped holes for installing the rotating shaft and the thrust bearing are formed in the center of the rotating disk; the positions, opposite to the bottom plate locking screw holes of the rotating disk bottom plate, on the rotating disk are provided with rotating disk locking stepped holes; a rotating disk locking assembly is installed above the rotating disk locking stepped holes; the rotating disk is further provided with a positioning pin hole which corresponds to the positioning holes in the rotating disk bottom plate; a plug pin assembly is installed above the positioning pin hole; a positioning boss is arranged on the middle portion of the rotating disk; the positioning boss is matched with a bottom hole of a machined conical cabin; and threaded rod installing screw holes are evenly distributed in the outer ring of the positioning boss on the rotating disk and used for installing a pressing plate, and the machined conical cabin is fixed.