The invention discloses equipment for liquefying animal cartilages. The equipment comprises an outer cavity, a first liquefying cavity and a second liquefying cavity, wherein an upper cover is detachably arranged at the upper end of the outer cavity in a sealing manner, a lower sealing cover is openably/closeably arranged at the lower end in a sealing manner, and a feeding hole and a first gas inlet are formed in the upper cover; the first liquefying cavity is coaxially arranged in the outer cavity in an up-down sliding manner; and the top surface of the second liquefying cavity is fixedly connected to the outer side wall of the outer cavity, and then the lower end of the outer cavity stretches into the second liquefying cavity. The invention further discloses a method for coproducing chondroitin sulfate, II-type collagen oligopeptide and II-type collagen polypeptide through liquefying the animal cartilages. According to the equipment, the animal cartilages can be subjected to primaryliquefaction and secondary liquefaction so as to generate liquefied matters, so that the processing flow of the animal cartilages is simplified, and the production efficiency is improved.