Disclosed are a method and an apparatus for detecting a game bot account in an online game. The method of detecting a game bot account in accordance with an embodiment of the present invention may include: evaluating an asset value for each account in a game; calculating a rate of change for each account based on a currently-evaluated asset value and a previously-evaluated asset value; and detecting a game bot account based on the calculated rate of change for each account. According to the embodiments of the present invention, the game bot account is detected based on the rate of change for each account, making it possible to detect the game bot account effectively even if the game bot account is used in a new form.