The present invention discloses a low damage bleaching method for a wool fabric. The low damage bleaching method specifically comprises the following steps: a pretreatment step, an oxidation step, an acid neutralization step, a reduction step, a whitening step, and a weak oxidation step, wherein the pretreatment step is performed in a pretreatment liquid with a pH value of 8.2-8.7, the oxidation step is performed in an alkaline solution containing hydrogen peroxide and a hydrogen peroxide catalyst, the acid neutralization step is performed in an acid environment with a pH value of 4.5-5.5, the reduction step and the whitening step are respectively performed in a solution containing a reduction agent and a solution containing a whitening agent, and the weak oxidation step is performed in a solution containing a small amount of hydrogen peroxide. The present invention further relates to a pure white wool fabric, wherein the pure white wool fabric is prepared according to the low damage bleaching method for the wool fabric. The wool fabric treated by the bleaching method of the present invention has the following characteristics that: whiteness of the wool can be more than 105%, and strength loss rate can be controlled within 30%.