The invention relates to a micro-adjustable disc milling cutter. The micro-adjustable disc milling cutter comprises a disc cutter body and a milling cutter blade, wherein the disc cutter body is provided with 4-8 rough milling cutter heads, each rough milling cutter head is provided with a rough milling cutter blade seat, and a rough milling cutter blade is fixed on each rough milling cutter blade seat through screw nails; two sides of the disc cutter body are respectively provided with a finish milling cutter head, each finish milling cutter head is provided with a raised step, each finish milling cutter head is provided with a finish milling cutter blade seat, and a finish milling cutter blade is arranged on the finish milling cutter blade seat through screw nails; a micro-adjusting groove capable of enabling the cutter head to deform is formed in the finish milling cutter blade seat, and the width of the groove is 0.2-0.5 mm; screw hole installation adjusting screw nails and unthreaded hole installation compressing screw nails are arranged at the raised step at the front end of the groove, and the finish milling cutter blade seat is locked by the compressing screw nails after the size of the finish milling cutter blade is adjusted. The mounting position of the finish milling cutter blade is 0.1mm behind the rough milling cutter blade in the feeding direction. According to the micro-adjustable disc milling cutter, the cutter durability is greatly improved, and the cutter cost is reduced. Meanwhile, the production efficiency is improved through the combination of rough milling and finish milling; and the processing size precision is high, the stability is good, and the product quality is improved.