Provided is a device and method for controlling self-refresh which reduces current when a semiconductor device stays in a self-refresh operation. The device for controlling self-refresh includes a bulk voltage controller configured to combine an idle signal indicating an active termination state of a bank and a self-refresh signal so as to generate a control signal for controlling a bulk voltage, a bulk voltage driver configured to vary a level of the bulk voltage in response to the control signal, and output the bulk voltage with a different level, and a refresh controller configured to output the self-refresh active signal upon receiving the bulk voltage as a bulk bias voltage.