The invention relates to a novel collagenous fiber bonded leather for pets and a preparation method thereof. The collagenous fiber bonded leather is a sheet made of collagenous fiber or collagenous fiber and other edible raw materials by utilizing a regeneration method. The collagenous fiber is fibroid material obtained from animal skin containing collagen by utilizing a fiber separation method. Other edible raw materials comprise meat fibre/ or particles and the raw materials with a food calling function and a nutritional function. The preparation method comprises the following steps: pretreating raw material skin, acid swelling, separating fibre, pulping, filtering, dewatering collagenous fiber, lapping for filtering water, drying for crosslinking and the like.