Numerical control precise positioning telescopic jig frame and using method thereof

The invention relates to a numerical control precise positioning telescopic jig frame and a using method thereof, and relates to the field of steel structure component machining. The jig frame comprises a center column detachably connected to the ground, a plurality of lower jig frame columns and upper jig frame columns distributed in the circumferential direction of the center column, and adjusting rods and connecting rods arranged between the lower jig frame columns and the center column; one end of the connecting rod is rotationally connected with the central column, and the other end of the connecting rod is detachably connected with the adjusting rod; the lifting rotary telescopic mechanism is arranged between the upper jig frame column and the central column and is used for controlling the upper jig frame column to lift up and down, controlling the lower jig frame column to move towards one side close to or far away from the adjusting rod and controlling the connecting rod to rotate; and the movable loc