A method for realizing device-to-device communication relay selection, comprising: receiving, by a user equipment, relay-related information sent by an adjacent relay node; and selecting, by the user equipment, an access relay node; the method further comprises: before the user equipment receives the relay-related information, receiving, by the user equipment, a relay reception resource pool and/or a relay selection threshold preconfigured or sent by a network control node through broadcasting or dedicated signaling; wherein the relay selection threshold comprises: a relay selection minimum device-to-device communication link quality threshold, and/or a relay reselection device-to-device communication link threshold and/or a relay reselection hysteresis value; characterized in that , the method further comprises: when the user equipment has not selected the access relay node, or the user equipment has already selected the access relay node but a measurement result of measurement performed by the user equipment to the relay-related information sent by the selected access relay node is less than the relay reselection device-to-device communication link threshold, the user equipment monitoring the relay reception resource pool and receiving the relay-related information sent by the adjacent relay node; wherein the relay-related information comprises at least one of: a relay type supported by the adjacent relay node; a minimum number of hops from the adjacent relay node to a network node; an access forbidden state of the adjacent relay node; or Public Land Mobile Network PLMN information of the adjacent relay node. receiving, by a user equipment, relay-related information sent by an adjacent relay node; and selecting, by the user equipment, an access relay node; the method further comprises: before the user equipment receives the relay-related information, receiving, by the user equipment, a relay reception resource pool and/or a relay selection threshold preconfigured or sent by a network control node through broadcasting or dedicated signaling; wherein the relay selection threshold comprises: a relay selection minimum device-to-device communication link quality threshold, and/or a relay reselection device-to-device communication link threshold and/or a relay reselection hysteresis value; characterized in that , the method further comprises: when the user equipment has not selected the access relay node, or the user equipment has already selected the access relay node but a measurement result of measurement performed by the user equipment to the relay-related information sent by the selected access relay node is less than the relay reselection device-to-device communication link threshold, the user equipment monitoring the relay reception resource pool and receiving the relay-related information sent by the adjacent relay node; wherein the relay-related information comprises at least one of: a relay type supported by the adjacent relay node; a minimum number of hops from the adjacent relay node to a network node; an access forbidden state of the adjacent relay node; or Public Land Mobile Network PLMN information of the adjacent relay node. a relay type supported by the adjacent relay node; a minimum number of hops from the adjacent relay node to a network node; an access forbidden state of the adjacent relay node; or Public Land Mobile Network PLMN information of the adjacent relay node. <EOS>