Disclosed is a technology for detecting an erroneous operation of a task scheduler of a battery management system, which is capable of easily detecting an erroneous operation of a scheduler during an operation to improve stability of the battery management system. An apparatus for detecting an erroneous operation of a task scheduler of a battery management system according to an exemplary embodiment of the present invention includes: a first scheduler module configured to control a first task to be executed for every first period; a second scheduler module configured to control a second task to be executed for every second period; a task counting unit configured to increase the first counting value for the first scheduler module in accordance with the first period whenever the first task is executed, and increase the second counting value for the second scheduler module in accordance with the second period whenever the second task is executed; and an erroneous operation detecting unit configured to detect erroneous operations of the first scheduler module and the second scheduler module based on the first counting value and the second counting value.