Machining workpiece fixing center frame capable of being positioned and adjusted

The utility model relates to the technical field of mechanical workpiece machining, in particular to a machined workpiece fixing center frame capable of being positioned and adjusted. According to the machining workpiece fixing center frame capable of being positioned and adjusted, a workpiece can be protected and clamped, the workpiece is prevented from being damaged, and meanwhile the clamping position of the workpiece can be corrected conveniently. A machined workpiece fixing center frame capable of being positioned and adjusted comprises a supporting base, sliding bases, a rotating semi-ring, a plug pin and the like, the left sliding base and the right sliding base are slidably connected to the bottom of the supporting base, the rotating semi-ring is rotatably connected to the top of the supporting base, and the plug pin is connected between the rotating semi-ring and the supporting base in a clamped mode. The workpiece is clamped and stabilized through the idler wheels on the positioning piece, the idler