Disclosed are a device and method for automatically controlling frequency. The automatic frequency control device includes a frequency error detection unit configured to obtain a frequency error detection value of a received carrier, a frequency error prediction unit configured to calculate a first frequency error prediction value on the basis of the frequency error detection value when the frequency error detection value satisfies a preset first criterion, and a frequency error compensation unit configured to calculate a second frequency error prediction value by correcting the first frequency error prediction value, and compensate for a frequency of the carrier on the basis of the second frequency error prediction value when a frequency change rate of the received carrier satisfies a preset second criterion. Therefore, overshoot and undershoot effects are minimized, and thus frequency control may be correctly performed.