The invention relates to a turn-milling machining system and a turn-milling machining process. The turn-milling machining system comprises a workbench, a rotary table and a cutter assembly, wherein a first driving mechanism is arranged on the workbench; the rotary table is arranged on the workbench, is connected with the first driving mechanism, and comprises a station used for fixing a to-be-machined workpiece; the first driving mechanism drives the rotary table to rotate on the workbench, and then the rotary table drives the workpiece to rotate; the cutter assembly is arranged above the workbench, and comprises a cutter and a second driving mechanism; and the second driving mechanism is connected with the cutter. The turn-milling machining system and the turn-milling machining process have the advantages that driven by the first driving mechanism, the rotary table drives the workpiece to rotate horizontally; the cutter moves up and down in a curved surface machining process for corners and edges of the workpiece, and the workpiece is cut when the cutter moves up and down, so that corresponding curved surfaces are formed on the corners and edges of the workpiece; the workpiece and the cutter are driven by the first driving mechanism and the second driving mechanism respectively to be matched with each other, so as to achieve machining of the complex curved surfaces and turn-milling machining; and the turn-milling machining process is simple, less working procedures are adopted, and less time is consumed.