Embodiments of the invention provide a synchronization method for a DoIP entity in a vehicle Ethernet, and the DoIP entity, which are used for synchronization of DoIP entities. Any DoIP entity in thevehicle Ethernet is installed in the same vehicle. The method comprises steps of after the DoIP entity is powered, checking whether the DoIP entity is a synchronization manager by the DoIP entity, ifnot, executing a silence policy, if yes, multicasting a relation maintenance message periodically, so as to state that the DoIP entity is the synchronization manager; and when the DoIP entity is not the synchronization manager but has a synchronization demand, unicasting a synchronization inquiry message to the synchronization manager stated in the received relation maintenance message, and receiving a synchronization reply message returned by the synchronization manager, wherein the synchronization reply message carries a first confirmation code and synchronization information or carries a second confirmation code, the first confirmation code is used for representing synchronization success, the second confirmation code is used for representing synchronization failure, and the synchronization information at least comprises a vehicle identification number of a vehicle corresponding to the vehicle Ethernet.