We observed that squids exhibit different movement patterns in water depending on external stimuli. When startled or exposed to other stimuli, they use jet propulsion to move rapidly and avoid danger, whereas under unstimulated conditions, they move slowly and steadily. Based on this characteristic, we designed and built a squid-inspired robotic model to simulate the squid’s movement in water and further study its propulsion mechanism. After completing observations and collecting data, we attempted to make the model move like a real squid. To achieve this, we used the school’s 3D printer to design and manufacture various components. We also referred to the squid’s propulsion mechanism and designed a spring-loaded shell that can be mechanically controlled to extend and contract, coupled with a ratchet mechanism. This setup allows the spring to release energy quickly and conveniently, simulating the squid’s jet-propulsion thrust. By integrating these designs, we successfully created a Squid-Inspired Mechanical Model capable of propelling itself in water.