the present invention relates to a method for recycling of old corrugated container using flotation , followed by selective enzymatic treatment to fines portion and by selective refining to long fiber stream , and more particularly , to a method for recycling of occ , wherein occ is treated with floatation and enzymatic hydrolysis and those recycled stock is refined , thereby having the following effects : a ) the drainage property of base paper of old corrugated container is improved ; and b ) the strength of the same is enhanced by the refining treatment of the fractionated long fiber only ; and c ) the cost for disintegration and enzymatic treatment is reduced ; and the imported corrugated board and unbleached kraft pulp can be substituted by the korean old corrugated container .