The invention discloses an integral quenching method of a forged steel cold roller. The method comprises the following steps: the forged steel cold roller is fed in a furnace to heat to 350-450 DEG C for insulation by 4-6 hours, is continuously heated to 650-750 DEG C for insulation by 8-12 hours, and is continuously heated to 980-1090 DEG C for insulation by 16-24 hours; the rotating number of quenching equipment is adjusted within 35-50 r/min; the quenching water quantity is adjusted within 250-400 m3/h; the roller is lifted out to put on the quenching equipment; the spray quenching water cooling is performed for a roller body of the cold roller; the natural air cooling is performed for a roller neck; when the temperature of the roller is lower than 300 DEG C, the quenching is finished; the cold roller is lifted in the furnace for tempering, is heated to 200-250 DEG C for insulation by 12-24 hours, and is continuously heated to 300-570 DEG C for insulation by 36-48 hours; and after the tempering is finished, related data is checked for warehousing. The method performs synchronous heat treatment according to different positions and different modes of the roller, prevents the cracking rick of the roller through integral insulation sufficiency, and improves the machining efficiency.