The utility model discloses a two -wheeled electrodynamic balance car, present two -wheeled electrodynamic balance car are dwindled that (with high costs, weight is great), matter are fragilely easily split, diameter great not easy -to -use hand in balance car middle part reliably grips setting up top cap and the space between the bottom that the inner cup led to the fact between top cap and the bottom, the utility model discloses establish a cross axle in first pedal casing, the pedal casing of second, first pedal casing and cross axle fixation, the pedal casing of second is with cross axle rotation assembly and by the turned angle of the pedal casing of this second of limit structure restriction for the cross axle, a wheel assembly's shaft fixation lies in the one end of first pedal casing at the cross axle, and the 2nd wheel assembly's shaft fixation is on a wheel carrier, and the wheel carrier rotates the assembly lies in the pedal casing of second at the cross axle the other end to realize reliable security and portability (summary figure on the balance car mechanical structure: fig. 6).