The invention belongs to the technical field of information processing, particularly relates to a V2V route selection method, system and device based on online link duration prediction, and aims to solve the problem of low data transmission success rate caused by unstable route selection in Internet of Vehicles communication. The system method comprises the following steps: when a first node requests a data packet from a second node, judging whether a neighbor table of the second node comprises the first node or not; based on the corresponding data difference values in the data packets of thesecond node and the adjacent nodes, obtaining feature data; based on the feature data, obtaining a link duration prediction value through a link duration prediction model; based on the link duration prediction value, selecting an adjacent node corresponding to the maximum accessibility coefficient as a next hop node; and circularly judging whether the neighbor table of the next hop node contains the first node or not until the data packet is sent to the first node. According to the invention, the stability of route selection in Internet of Vehicles communication is improved, and the success rate of data transmission is improved.