Sonic toothbrush with improved structure

The utility model discloses a sonic toothbrush with an improved structure. The toothbrush comprises a toothbrush head, a toothbrush handle, a circuit board and a brushless motor, the circuit board iselectrically connected with the brushless motor; a control switch for controlling the brushless motor to work is arranged on the circuit board; the toothbrush handle is of a structure with two throughends. A motor circuit board framework of an integrally-formed structure is connected into the toothbrush handle in a sleeved mode. A motor mounting groove and a battery mounting groove are formed inthe motor circuit board framework; the brushless motor is mounted in the motor mounting groove; a lithium battery electrically connected with the circuit board is installed in the battery installationgroove, a vibration shaft of the brushless motor extends out of the front end of the toothbrush handle and then is connected into a vibration hole in the rear end of the toothbrush head in a sleevedmode, the toothbrush handle i