The application discloses an amphibious bionic robotic fish, and belongs to the technical field of bionic robots. The fish body, the main frame, the
tail fin driving structure, the pectoral fin driving structure, the linkage type multi-legged structure integrated in the fish body and the hatch structure are included. The hatch structure includes a hatch and a hatch driving mechanism. When the hatch is opened, the multi-legged structure is exposed for land walking. When the hatch is closed, the fish body is streamlined for
underwater movement. The linkage type multi-legged structure is composed of four four-legged modules. Each four-legged module contains a double-
crank rocker mechanism. The double-
crank has a 180°
phase difference to ensure walking stability. Four independent power sources are used to drive walking and differential steering. The
tail fin driving structure realizes passive swinging of the
tail fin through a tension spring. The pectoral fin driving structure assists in adjusting the
underwater posture. The linkage type multi-legged structure is integrated in the fish body without the need for external additional modules or complex deformation mechanisms. The structure is compact, the water-land
mode switching is reliable, the motion stability is strong, the water-land cross-medium moving task can be autonomously completed, and the application is suitable for
underwater detection,
environmental monitoring and other fields.