The invention provides a tandem type hybrid power variable wing type bionic mechanical fish underwater vehicle, and belongs to the technical field of underwater vehicles. The tandem type hybrid powervariable wing type bionic mechanical fish underwater vehicle aims to solve the problems that the efficiency is low, the underwater stability is poor, and the cruising capability is poor existing in the prior art. The tandem type hybrid power variable wing type bionic mechanical fish underwater vehicle comprises a vehicle frame, a vehicle frame connection frame, a shell, ten flap type fish wings, aswing type fish tail and an electronic control system, wherein the connection frame comprises a fish wing connection frame and a fish tail connection frame which are connected in proper sequence; thefish wing connection frame is located in the shell, and the fish tail connection frame extends out from the tail end of the shell. The ten flap type fish wings are connected with the fish wing connection frame and extend out from the shell, and the ten fish wings are distributed on the same oval, and are symmetrical about the common axis of the fish wing connection frame and the fish tail connection frame. The opening angles of the fish wings can be adjusted, and the fish wings can be retracted back or extend out backwards. The swing type fish tail is connected with the end of the fish tail connection frame, and the electronic control system supplies power to the whole vehicle and controls whole actions.