ROBO-SHARK is a bionic underwater robotic platform used in the ocean with high speed and low noise. Thanks to its feature of being able to track the target quickly, ROBO-SHARK can do missions like closing up rapidly, cruising with high mobile force. The robot takes the real shark as the prototype, with the motion being generated by the three-joint caudal fin instead of the propeller that can effectively lower the noise cause by the operation and reduce the power consumption as well. The shell is made from sound-absorbing material which makes it can be easily disguised. With the motion being generated by the caudal fin, ROBO-SHARK can travel at speed up to 10 knots.