Bionic robotic fish

The utility model discloses a bionic robotic fish. The device comprises a fish head mechanism, a fish body mechanism and a fish tail mechanism, a laser scanner is arranged at the lower part of the fish head mechanism; the laser scanner is fixedly connected with a sliding block capable of moving up and down; the sliding block is connected with a scanning mechanism motor through a first transmissionmechanism; a snorkeling mechanism is arranged at the lower part of the fish body mechanism; the snorkeling mechanism comprises a cylinder body; wherein a first cavity and a second cavity are formed in the cylinder body; a water suction and drainage opening is formed in the second cavity, a piston is connected into the second cavity in a sealed and sliding mode, a motor is arranged in the first cavity and connected with a ball nut, a ball screw is arranged at the axis of the ball nut, the scanning mechanism motor and the motor are each connected with a sub-controller, and the sub-controllers are connected with a main