A driving device for high-speed reciprocating rotation of an electric tooth cleaning instrument, comprising a driving coil (A2), a rotation shaft assembly, driving permanent magnets (A4, A5), an energy storage means, a front end cover (A6), and a rear end cover (A10). The rotation shaft assembly comprises a rotation shaft (A7) and a magnetic conductor (A3) fixedly connected to the rotation shaft (A7). The magnetic conductor (A3) surrounds the rotation shaft (A7) a portion, on one side of the rotation shaft (A7), of the magnetic conductor (A3) is provided with a single-side rotation shaft magnetic conductor protrusion (A31) the rotation shaft magnetic conductor protrusion (A31) penetrates into or penetrates through a hollow part of the driving coil (A2) and is provided with an electrode yoke end distant from the rotation shaft (A7) direction the driving permanent magnets (A4, A5) are respectively distributed at positions close to two sides of the electrode yoke end of the rotation shaft magnetic conductor protrusion (A31) magnetic gaps (D1) are formed between the driving permanent magnets (A4, A5) and the electrode yoke end of the rotation shaft magnetic conductor protrusion (A31) in the moving process of the rotation shaft magnetic conductor protrusion (A31), the sizes of the magnetic gaps (D1) are kept to range from 0.1 mm to 2 mm. By means of the driving device the electric tooth cleaning instrument is miniaturized. The driving device can be applied in childrens tooth cleaning instruments.La présente invention concerne un dispositif dentraînement pour la rotation alternative à grande vitesse dun instrument électrique de nettoyage de dents, comprenant une bobine dentraînement (A2), un ensemble darbre de rotation, des aimants permanents dentraînement (A4, A5), un moyen de stockage dénergie, un couvercle dextrémité avant (A6) et un couvercle dextrémité arrière (A10). Lensemble darbre de rotation comprend un arbre de rotation (A7) et un conducteur magnétique (A3) reli
