Disclosed is a coaxial coplanar dual rotary wing flying saucer which comprises a saucer shell, a saucer cabin, a rotary wing system and a motive power device, wherein the rotary wing system consists of two coaxial coplanar rotary wing wheels imbedded inside and outside. The inside rotary wing wheel and the outside rotary wing wheel are respectively provided with an operation guide rail; the guide rails supply driving force for the inside rotary wing wheel and the outside rotary wing wheel and control movement of the inside rotary wing wheel and the outside rotary wing wheel; the inside rotary wing wheel and the outside rotary wing wheel rotate in opposite directions when in work, supply lifting force for the flying saucer and simultaneously offset with a reactive torque function to a saucer body, thereby enabling the reactive torque exerted on the saucer body to be zero and realizing stable flight of the flying saucer; the coplanar structure distribution reduces mutual effect of gas streams generated by dual rotary wings and easily controls flight, and compact structure of the flying saucer further enables the flying saucer to be conveniently utilized in various air crafts with limited space.