Toothbrush head transmission structure and electric toothbrush

The utility model discloses a toothbrush head transmission structure and an electric toothbrush, the toothbrush head transmission structure comprises: a driving assembly, the driving assembly comprises a driving member and an output shaft, the driving member is used for driving the output shaft to rotate in a reciprocating manner; the transmission part comprises a main body part and a transmission part, the main body part is fixedly connected with the output shaft, and the output shaft drives the main body part to rotate back and forth with the output shaft as the rotation center; the bristle carrier comprises a bearing part and an eccentric part which are fixedly connected with each other, a positioning hole is formed in the center of the bearing part in the first direction perpendicular to the axial direction of the output shaft, and the eccentric part is closer to the output shaft than the positioning hole in the axial direction of the output shaft; the transmission part drives the eccentric part to move t