The invention discloses a method for whitening agar under assistance of an enzymatic method. Gracilaria verrucosa is taken, put in an alkaline solution and treated at the constant temperature for 2-5h, the alkaline solution is removed, and the gracilaria verrucosa is blanched to be neutral; water and oxalic acid are added, the pH is adjusted with acid to range from 4.5 to 6.5, complex enzyme is added at the temperature of 45-60 DEG C, the gracilaria verrucosa is treated at the constant temperature for 1-3 h, an enzyme solution is removed, and the gracilaria verrucosa is rinsed to be neutral;a metal chelating agent is added, metal ions are removed, and the gracilaria verrucosa is filtered and rinsed to be neutral; a sodium hypochlorite solution is added, and the gracilaria verrucosa is treated for 20-60 min, filtered and rinsed to be neutral; water is added, and the gracilaria verrucosa is boiled to be completely molten and then filtered for residue removal; a gel solution is rapidlycooled, slit, subpackaged, subjected to oil-pressure dewatering, dried, crushed and sieved, and powder is collected. The method is applied to agar extraction through biological blanching under assistance of chemical blanching, usage of chemical agents is reduced, harm to body health is reduced, pollution to the environment is reduced, the production cost is saved, and the method has great significance for sustainable development of agar production enterprises.