The invention relates to a monostable radial magnetic bearing with low power consumption and a zero gravity action, which belongs to the field of magnetic suspension bearings and comprises an outer magnetic conduction ring, an outer magnetic isolation ring, an iron core of a stator, an excitation coil, an inner permanent magnetism ring with axial magnetization, an iron core of a rotor, an inner magnetic isolation ring, an inner magnetic conduction ring, inner permanent magnetism rings with radial magnetization, an outer permanent magnetism semiring with axial magnetization, an air gap and a rotor shaft. The iron core of the stator comprises electromagnetic iron cores and permanent-magnetism iron core rings, which form total eight electromagnetic poles at the left end and the right end of the bearing and four semicircular ring type permanent magnetism poles together, wherein the two upper semicircular rings generate attractive force, and the two lower semicircular rings generate repulsive force. In the negative direction of the Y axis of the stator, the outer permanent magnetism semiring with axial magnetization is clamped between the two permanent-magnetism iron core rings of the stator by the outer magnetic conduction ring, the inside of the iron core of the stator is provided with the iron core of the rotor and the inner permanent magnetism rings with radial magnetization, the iron core of the rotor is positioned in the middle, the inner permanent magnetism rings with radial magnetization are positioned at both ends, the middle of the inner magnetic conduction ring is clamped with the inner permanent magnetism ring with axial magnetization, and the air gap is arranged between the inner surface of the stator and the outer surface of the rotor.