The present invention discloses a method, a device and a system for enabling a routing function and transmitting data, which relate to the field of communications, and are capable of sharing a single session task through a plurality of access points, thereby ensuring data transmission quality. When a station uses an external network identifiable address, and performs data transmission of a single session task through a first access point, an address of a CR router connected to the first access point is determined; at least one second access point connected to the same CR router with the first access point is determined; a CR enabling request message is sent to a CR router corresponding to the CR router address through each of the access points associated with the CR of the station; a CR enabling feedback message returned by the CR router and forwarded via the access points associated with the CR of the station is received, so that the station sends different data packets of the single session task through the first access point and the second access point separately. Embodiments of the present invention are mainly used for data transmission in a wireless network.