The invention discloses a method for accurately controlling carbon content of 600MPa dual-phase steel tundish molten steel. The method comprises the procedures of blast furnace smelting, molten iron desulphurization, decarburization converter smelting, LF refining and middle slab continuous casting. The carbon mass fraction of continuous casting tundish molten steel fluctuates within the range of0.010% through decarburization converter end point control, tapping charging control, deoxidation process control, LF narrow composition control, temperature control of the whole steelmaking procedureprocess and recarburizaition control of the continuous casting procedure. The center segregation of a continuous casting slab can reach grade B0.5 or below, the oxygen mass fraction of tundish moltensteel is controlled within 30 ppm, the nitrogen mass fraction is controlled within 50 ppm, high-quality hot-rolled coiled plates are produced through hot rolling, and high-quality continuously annealed products are finally produced through cold rolling.