The present invention provides a method for reporting user equipment assistance information, a user equipment, and a base station. The method includes: if a configuration in a user equipment UE for forbidding sending UE assistance information is not started or is closed, sending, by the UE, the UE assistance information to a base station; or, if a configuration in a UE for allowing sending UE assistance information is started, sending, by the UE, the UE assistance information to a base station. The foregoing method does not increase a signaling overhead of an air interface, and meanwhile, enables a base station to better optimize performance of a UE according to UE assistance information.