A method for accurately adjusting an automatic diameter control (ADC) camera includes before pulling a monocrystalline silicon ingot, obtaining a height variation value of an ADC camera from a solid-liquid interface of a melt by separately comparing variations of thermal field accessories provided corresponding to the monocrystalline silicon ingot and a previous monocrystalline silicon ingot. Based on a geometric relationship between the height variation value and a horizontal displacement of the ADC camera, a horizontal displacement of the ADC camera is obtained according to the height variation value, wherein the horizontal displacement is a first horizontal displacement or a second horizontal displacement. The method also includes moving the ADC camera horizontally to a target position according to the horizontal displacement of the ADC camera.