The invention discloses a method for preparing bleached pulp through dendrocalamus latiflorus, and belongs to the technical field of papermaking. Unbleached pulp is prepared through the steps of secondary pretreatment, washing, screening, bleaching and the like. The prepared bleached pulp is high in yield and whiteness; the brightness, tensile index and softness of tissue produced subsequently are high, and the tissue has no stimulation or adverse reaction to human skin.