The invention provides a bionic multi-navigation-state deep unmanned submersible. An underwater camera is arranged in the center of the bow of a deep unmanned submersible body, and telescopic mechanical arms are arranged on the two sides of the bow of the deep unmanned submersible body correspondingly. The two sides of the middle of the deep unmanned submersible body are each provided with side-scan sonar. A tuna bionic tail fin is arranged at the tail of the deep unmanned submersible body. Three sets of grooves are formed in the lower portion of the deep unmanned submersible body. A set of walking legs is arranged in each groove and includes two walking legs. Each walking leg comprises a first motor installed in the deep unmanned submersible body, a first arm hinged to an output shaft of the first motor, a second arm hinged to the end of the first arm, and a third arm hinged to the end of the second arm, wherein a second motor is arranged at the hinge position of the first arm and the second arm, a third motor is arranged at the hinge position of the second arm and the third arm, and the second arm is a bent arm. The bionic multi-navigation-state deep unmanned submersible can travel at the seabed and sample targets at the seabed.