The invention discloses a controlling method of motor zoom lens automatic focusing. The method comprises the following steps that initialization is carried out after the motor zoom lens is electrified; a zoom zero point and a focusing zero point are searched separately, and both zoom position and focusing position of the motor zoom lens are returned to zero points of factory default; according to power-off memory, the motor zoom lens is zoomed to memory multiple; after the focusing follows a focusing curve to memory focus, automatic focusing is implemented; the motor zoom lens is in a standby state and waits for a zoom demand; according to the zoom demand, the motor zoom lens is zoomed to the corresponding multiple; according to focusing tracking curves with different focal lengths, the focusing is driven in real time to the corresponding focusing position. According to the controlling method of motor zoom lens automatic focusing, automatic focus regulation is carried out in the focal length regulation process, clear camera pictures in the whole zooming process can be guaranteed, and focus regulating again is not needed; besides, a lens can be used in a plurality of scenes, the manual disassembly is not needed, only the software regulation is needed, focus can be adjusted by a module automatically, and the pictures are kept clear.