Intelligent machining production line and intelligent machining method

An intelligent machining production line comprises a first machining unit, a second machining unit, a third machining unit, a circulating flow transmission line, cutting equipment, a fixed clamp, a movable clamp and an automatic feeding device. The first machining unit, the second machining unit and the third machining unit are sequentially located on the upstream, the midstream and the downstream of the circulating flow transmission line, the first machining unit and the second machining unit are fixedly arranged, and the third machining unit is movably arranged; a material is fed into the fixed clamp on the circulating flow transmission line through a mechanical arm, and the length is cut to the preset size through the cutting equipment; the movable clamp conveys the cut material to the first machining unit, and the first machining unit machines the top face of the cut material; the second machining unit is used for machining two side surfaces of the material; and the third machining unit enters an unfinish