The invention discloses a coaxial different-direction dual-propeller device based on annular motors and a realization method thereof. The device comprises the two annular motors which are symmetrically arranged on the two sides of propellers and are of the same structure, both the annular motors comprise motor stators in a hollow cylinder shape, coils are wound around the outer walls of the motor stators, and the inner walls of the motor stators are fixedly connected with outer rings of bearings; each motor rotor is composed of two barrel-shaped structures embedded into each other and an annular structure, the internal barrel-shaped structures penetrate through the centers of the bearings and are fixedly connected with the inner rings of the bearings, the motor stators are sleeved with the external barrel-shaped structures, magnetic pieces are inlaid into the inner walls, the motor stators, the motor rotors and the bearings are of symmetrical structures, and the symmetry axes of the motor stators, the motor rotors and the bearings coincide with one another; the centers of H-type structural supports penetrate through the motor rotors and the centers of the bearings, and the two sides of the H-type structural supports are fixedly connected with the motor stators; the annular-structure bottoms of the motor rotors of the two annular motors are fixedly connected with the two propellers. The invention further discloses a method for realizing rotating through the device. The device can easily achieve multi-propeller coaxial design, and has the advantages of being simple in structure, high in reliability and easy to realize.