Posture adjusting device of bionic robotic fish capable of autonomously propelling fish

The invention discloses a posture adjusting device of a bionic robotic fish capable of autonomously propelling fish, and relates to the technical field of bionic robotic fish, the posture adjusting device comprises a fish body, and the fish body comprises a shell; a gravity center adjusting assembly which is located in the shell so as to adjust the gravity center of the fish body, and the gravity center adjusting assembly comprises at least one balancing weight and a lead screw sliding block mechanism for driving the balancing weight to move in the head-tail direction; the water suction and drainage system is located in the shell so as to adjust the weight of the fish body, and the water suction and drainage system comprises a pressurized water tank and a water control assembly used for controlling the water level in the pressurized water tank. According to the posture adjusting device, the gravity center adjusting assembly and the water suction and drainage system are combined to quickly change the weight an