The invention discloses an automatic photography control device for a power line inspection unmanned aerial vehicle, and a control method thereof. The automatic photography control device is fixed on metal structure at the front end of an unmanned aerial vehicle body and located above a detection head. The automatic photography control device mainly comprises a control circuit and a battery. The control circuit and the battery are disposed in a box. The control circuit comprises a single-chip microcomputer, a servo steering engine, a wireless receiver, an LCD (liquid crystal display), keys, a camera photography control module, a power management module, and a battery. The single-chip microcomputer is respectively connected with the servo steering engine, the wireless receiver, the LCD, the keys, the camera photography control module, the power management module and the battery. The battery is further connected with the power management module. The automatic photography control device is obtained according to experiments and practical needs in power line inspection with the unmanned aerial vehicle, and allows the unmanned aerial vehicle to take photos efficiently, quickly and simply during power line section.