Collagen fiber yarn production process based on broken leather

The invention relates to the technical field of collagenous fiber yarn production, and particularly discloses a collagenous fiber yarn production process based on broken leather, which comprises the steps of raw material collection and preparation, ultrasonic treatment, enzymolysis treatment, acid retreatment, nanoscale modification, spinning and finishing. According to the method, by-products such as the crushed leather are used for production, recycling of waste resources is achieved, environmental pollution is reduced, the concept of sustainable development is met, waste such as the crushed leather is adopted as raw materials, compared with fresh leather, the cost is lower, and therefore the production cost is reduced, and the production benefit is improved; through the process steps of ultrasonic treatment, enzymolysis treatment, acid retreatment, nanoscale modification and the like, the purity and quality of collagen can be improved, the produced yarn is more uniform in texture and more excellent in qual