An apparatus and method for controlling abnormal traffic are provided. The apparatus includes: a list management unit which stores a list of Internet Protocols (IPs) transmitting normal packets and, conditionally, announces that the current packet traffic is packet traffic generated by a registered IP; a channel allocation unit which allocates channels to the input packets in such a manner that a packet determined as being normal is given priority over a packet determined as being abnormal, transmits the input packets to a network node, and transmits IP information regarding the input packets that are determined as being normal; a success rate determination unit which determines a service success rate for packets received from a registered IP; and a channel number adjustment unit which transmits the predetermined command to the channel allocation unit so that the channel allocation unit can adjust the number of channels reserved for allocation to normal packets.