The invention provides a high-reliability compact three-dimensional magnetic flux loop motor and an application thereof. The three-dimensional magnetic flux loop motor comprises a stator and a rotor.The cross sections of the stator and the rotor are U-shaped cross sections which are mutually and correspondingly matched. The stator comprises an annular stator magnetic conductor and an annular coil. The rotor comprises rotor magnetic conductors which are evenly distributed around the motor shaft and have the U-shaped cross section and rotor permanent magnets which are clamped between the adjacent rotor magnetic conductors. The rotor permanent magnets are circumferentially magnetized, and the polarity of the adjacent permanent magnets is opposite. The stator magnetic conductor is provided with stator magnetic conductor convex teeth which are corresponding in a dislocation way according to the angle of the rotor magnetic conductors. The interval of the stator magnetic conductor convex teeth and the rotor is the air gap. The motor can be used as an electric motor and an angle sensor. According to the structural design of the technical scheme, the three-dimensional magnetic flux loop structure is formed and has high energy density so as to have the advantages of compact structure, low magnetic interference, low weight, high reliability and convenient installation and positioning andhave wide application prospect.