A duplication transmission maintaining method, applied to a terminal and comprising: maintaining a duplication transmission timer for a duplication transmission of a target bearer; wherein the maintaining the duplication transmission timer for the duplication transmission of the target bearer comprises at least one of: receiving an activation signaling for the duplication transmission of the target bearer and sent by a network device, and starting the duplication transmission timer corresponding to the duplication transmission of the target bearer; or the terminal determining to activate duplication transmission for the target bearer and starting the duplication transmission timer corresponding to the duplication transmission of the target bearer; and, characterized in that the maintaining the duplication transmission timer for the duplication transmission of the target bearer further comprises at least one of: during a running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal receiving the activation signaling for the duplication transmission of the target bearer and sent by the network device, and restarting the duplication transmission timer corresponding to the duplication transmission; or during the running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal restarting the duplication transmission timer corresponding to the duplication transmission every time the terminal performs the duplication transmission; or deactivating the duplication transmission of the target bearer when the duplication transmission timer expires. maintaining a duplication transmission timer for a duplication transmission of a target bearer; wherein the maintaining the duplication transmission timer for the duplication transmission of the target bearer comprises at least one of: receiving an activation signaling for the duplication transmission of the target bearer and sent by a network device, and starting the duplication transmission timer corresponding to the duplication transmission of the target bearer; or the terminal determining to activate duplication transmission for the target bearer and starting the duplication transmission timer corresponding to the duplication transmission of the target bearer; and, characterized in that the maintaining the duplication transmission timer for the duplication transmission of the target bearer further comprises at least one of: during a running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal receiving the activation signaling for the duplication transmission of the target bearer and sent by the network device, and restarting the duplication transmission timer corresponding to the duplication transmission; or during the running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal restarting the duplication transmission timer corresponding to the duplication transmission every time the terminal performs the duplication transmission; or deactivating the duplication transmission of the target bearer when the duplication transmission timer expires. receiving an activation signaling for the duplication transmission of the target bearer and sent by a network device, and starting the duplication transmission timer corresponding to the duplication transmission of the target bearer; or the terminal determining to activate duplication transmission for the target bearer and starting the duplication transmission timer corresponding to the duplication transmission of the target bearer; and, characterized in that the maintaining the duplication transmission timer for the duplication transmission of the target bearer further comprises at least one of: during a running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal receiving the activation signaling for the duplication transmission of the target bearer and sent by the network device, and restarting the duplication transmission timer corresponding to the duplication transmission; or during the running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal restarting the duplication transmission timer corresponding to the duplication transmission every time the terminal performs the duplication transmission; or deactivating the duplication transmission of the target bearer when the duplication transmission timer expires. during a running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal receiving the activation signaling for the duplication transmission of the target bearer and sent by the network device, and restarting the duplication transmission timer corresponding to the duplication transmission; or during the running period of the duplication transmission timer corresponding to the duplication transmission of the target bearer, the terminal restarting the duplication transmission timer corresponding to the duplication transmission every time the terminal performs the duplication transmission; or deactivating the duplication transmission of the target bearer when the duplication transmission timer expires.