The invention discloses a two freedom degree lorentz force outer rotor spherical surface magnetic bearing. The two freedom degree lorentz force outer rotor spherical surface magnetic bearing comprises coils, magnetism isolating convex plates, a stator spherical surface magnetic conductive ring, magnetism isolating screws, epoxy resin glue, an installation pedestal, spherical surface magnetic steels, a magnetism isolating ring, a rotor magnetic conductive ring, a rotor locknut, and a rotor sleeve; the two pairs of coils are used for magnetic bearing radial direction X and Y deflection control respectively, and are fixedly arranged on the stator spherical surface magnetic conductive ring via the epoxy resin glue; the spherical surface magnetic steels are arranged on the radial outer sides of the coils; the inner spherical surfaces of the spherical surface magnetic steels and the outer spherical surface of the rotor magnetic conductive ring are arranged with spherical shell gaps so as to form air gaps. The two freedom degree lorentz force outer rotor spherical surface magnetic bearing is provided with spherical shell gaps, so that the rotor is capable of realizing wide-angle deflection, and a disadvantage of conventional columnar air gap lorentz force of magnetic bearing that, deflection angle is relatively small, is avoided. And in addition, Ampere force generated by current coil current is always tangent to the spherical surface of the coil no matter which position the rotor is deflected to, that is to say, force arm of the force couple composed of the Ampere force of each pair of coils is constant, and lorentz force control moment precision is improved.