The present invention provides a method and a device for transmitting wireless information. The method includes: sending, by an access controller, a first CAPWAP tunnel establishment request to a multi-service control gateway, wherein the first CAPWAP tunnel establishment request is used for requesting to establish a first CAPWAP tunnel; receiving, by the AC, a first CAPWAP tunnel establishment response sent by the MSCG; receiving, by the AC, wireless access information of a user sent by an AP; and sending, by the AC, the wireless access information of the user to the MSCG through the first CAPWAP tunnel. According to the embodiments of the present invention, by establishing a CAPWAP tunnel between the AC and the MSCG, the AC is enabled to transmit wireless access information of a user to the MSCG under the condition that the AC is separate from the MSCG.