Chitin is a natural biopolymer found in the exoskeletons of shellfish. Although it exhibits exceptional biopolymeric properties, it is limited by its low rigidity, which restricts its potential in applications requiring high levels of mechanical strength. This study, a composite material (Chitin/Graphene) was developed, based on chitin (biopolymer) obtained from the deproteinization and demineralization of shrimp exoskeleton waste. Graphene is obtained through functionalization with three strong acids H \(_{2}\) SO \(_{4}\) , HNO \(_{3}\) , and HCl and subsequently neutralized with 5% ammonium hydroxide. For the preparation of the composite material, processed chitin and graphene in solution were used, mixing the two components at 350 rpm and a temperature of 40  \(^{\circ }\) C. As a result of the mechanical testing to characterize the material (Chitin/Graphene), an average hardness of 76.69HD, an ultimate yield strength of 2.92298 N/mm \(^{2}\) , a deformation of 0.3%, and a maximum tensile stress of 3MPa were obtained. A thermogravimetric (TG) and differential thermal analysis (DTA) revealed an initial mass loss at 170  \(^{\circ }\) C. The material exhibited thermal stability up to 340  \(^{\circ }\) C, beginning to decompose at 385.79  \(^{\circ }\) C. These values indicate that the material (Chitin–Graphene) has variable mechanical strength, good thermal stability, and hardness, making it potentially useful in various applications.