The invention provides a double cutter plate type super-precise fly-cutting milling machine and relates to a milling machine. The invention aims to solve the problems of low rigidity and low processing efficiency of a spindle system of a present KDP super-precise processing lathe. The milling machine comprises a marble T-shaped machine body, horizontal linear guide rail systems, a longitudinal linear guide rail system, a double cutter plate spindle system and an air vibration-isolating supporting system, wherein the horizontal linear guide rail systems and the longitudinal linear guide rail system are vertically distributed on the marble T-shaped machine body; the horizontal linear guide rail systems are located at the two ends of the longitudinal linear guide rail system; the double cutter plate spindle system is located on a longitudinal upper sliding plate; and relative movement is formed between two vacuum chucks and the double cutter plate spindle system. The high-precision linear feeding motion, the rotary motion of the cutter plate and the simultaneous cutting of double workpiece are realized by the double cutter plate type super-precise fly-cutting milling machine; the hydrostatic pressure control mode is adopted by both of the guide rail and spindle; and the double cutter plate type super-precise fly-cutting milling machine has the advantages of high precision and high rigidity.