The motion simulation and energy consumption analysis of the amphibious compound legs robot were carried out. An amphibious hexapod robot with curved leg and paddle was designed, and the walking mechanism of its ground triangle gait was analyzed and the motion models of the legs rotation joint were extracted. The energy consumption composition of the robot was analyzed, and the single cycle energy consumption calculation model was obtained by simplifying.Nine kinds of robot 3D model with different leg length parameters were constructed, and the planned revolute joint trajectory was set up in ADAMS software to realize motion simulation.The simulated motor torque was extracted, and the energy consumption in one cycle was calculated and analyzed. The results show that the energy utilization efficiency can be improved by appropriately reducing the legs length parameters of the robot, which has certain reference significance for improving the overall performance of the legged robot.