Toothbrush head swing control method and system of electric toothbrush

The invention relates to a toothbrush head swing control method and system for an electric toothbrush, and the method comprises the steps: obtaining an initial magnet angle through a control module, and presetting a large swing angle and a small swing angle through the control module; the control module starts the motor to enable the rotating shaft of the motor to drive the magnet to rotate; if the toothbrush head rotates reversely to complete a large-swing angle once, the judgment module generates a first signal according to the angle of the magnet obtained in real time and sends the first signal to the control module, and the control module executes an instruction according to the first signal, controls the motor to rotate forwards and performs small-swing reciprocating rotation at the same time; and if the toothbrush head rotates forwards to complete a large-swing angle once, the judgment module generates a second signal according to the angle of the magnet obtained in real time and sends the second signal