Electric toothbrush head assembly and electric toothbrush

The utility model belongs to the technical field of toothbrushes, and discloses an electric toothbrush head assembly and an electric toothbrush, the electric toothbrush head assembly comprises a brush head rod, a bearing, a brush head and a deflector rod assembly, a mounting cavity extending in the axial direction is arranged in the brush head rod, one end of the mounting cavity is provided with a mounting opening facing in the radial direction, and the bearing is arranged in the mounting opening; the brush head is rotationally arranged at the mounting opening through a bearing, the rotating axis of the brush head and the rotating axis of the bearing are collinear, the deflector rod assembly comprises a deflector rod and a supporting sleeve, the supporting sleeve is connected to the cavity wall of the mounting cavity, the deflector rod penetrates through the supporting sleeve, one end of the deflector rod is a poking end, the other end of the deflector rod is a driving end, and the poking end is movably conne