Disclosed are a method and a device for deleting a service flow. Direction information is carried in a dynamic service deletion request, so that a central access point CAP can not only delete a downlink service flow established by the CAP itself, but also actively delete an uplink service flow established by a station STA, so as to avoid that the STA occupies service flow resources for a long time when no service occurs during a long period of time or abnormal circumstances occur.