Abstract: Gelatin is a collagen derivative compound found in the skin, bones, and connective tissue of animals that are hydrolyzed using acidic or basic solutions. The industry that uses gelatin the most is the food industry. Cork fish skin has a very high protein and is rich in albumin so that it can be used by people with hypalbumin (low albumin) and accelerate wound healing. The process of making gelatin has 2 extraction methods, namely the acid and base method. The extraction process using the acid method is faster than using the base method, because the acid solution hydrolyzes collagen to gelatin more be faster. For this reason, HCl solutions are used in research to determine the effect of adding concentration on the process of making gelatin. Giving different concentrations during the manufacturing process is expected to produce the best quality gelatin concentration in chemical and physics.