The invention discloses a method and device for providing content distribution network CDN service. The method comprises the steps that wireless access network equipment monitors a service request sent by UE; according to the service request, the wireless access network equipment determines that CDN service needs providing for the UE; the wireless access network equipment establishes connection with the UE; the wireless access network equipment provides the CDN service for the UE through connection with the UE. The method and device achieve the purpose that the wireless access network equipment provides CDN service, reduce data flow of the wireless access network equipment, a core network and an internet server, overcome the defect of Backhaul return network flow pressure existing in a CDN structure in relevant technologies, and improve user experience of data service.