The invention provides a synchronous zooming method for a laser lens and a visible light lens. The method comprises the following steps: acquiring a zooming feedback potential of the visible light lens by taking a synchronous main board as a control unit; converting the zooming feedback potential into the zooming times of the visible light lens and the zooming times of the corresponding laser lens; and meanwhile, driving a stepping motor of the laser lens by the synchronous main board to zoom the laser lens to the calculated times, thereby achieving the effect that laser spots form an inscribed circle in the center of the visual field of the visible light length and realizing a synchronous zooming function of the visible light lens and the laser lens. Through adoption of the method, the perfect fusion of the visible light lens and the laser lens with super long focal lengths is realized; dust, smoke, rain and snow as well as darkness can be penetrated; a perfect and clear image can bepresented at night.