Provided is an apparatus for generating a ranging binary code sequence at a high-speed, and a method thereof. The apparatus includes: an initial register value generator for generating initial register values of minimum valid ranging codes; a storage for storing the generated initial register values of the valid ranging codes(≦K, where K is the ranging value transmitted by base station); a binary code sequence generator for generating a binary code sequence of a corresponding ranging code; and a procedure for incrementally updating the initial register values as receiving the new ranging code from base station.