Active stylus and control method

The invention discloses an active touch pen and a control method, and the active touch pen comprises a touch pen body, and an optical magnifying lens, a camera module, a processor, a wireless signal transmission module and a pen signal generation module which are installed on the touch pen body. The camera module, the wireless signal transmission module and the pen signal generation module are electrically connected with the processor; and the touch pen body comprises a pen holder and a touch pen point, the touch pen point and the optical magnifying lens are both arranged at the same end of the pen holder, the optical magnifying lens is arranged in the center of the end of the pen holder, the touch pen point is arranged on the edge of the optical magnifying lens, and the camera module is arranged in the pen holder and corresponds to the optical magnifying lens. The touch pen point is electrically connected with the pen signal generation module. According to the active touch pen, the optical magnifying lens ma