The invention provides a frequency coordination and allocation method for a multichannel multi-hop vehicular ad hoc network. The method comprises the steps that: any node broadcasts a channel detection frame to a neighbor node; when a source node is about to send data to a target node, the source node adds a source routing detection frame in the channel detection frame, and then selects two channels with the optimal channel quality to the neighbor node; whether a next hop stabilization condition is satisfied is judged; the source node receiving a source routing detection frame replay selects the optimal next hop and the secondary optimal next hop according to the movement speed and the position of the next hop contained in the source routing detection frame replay; an optimal link is selected to send a data packet; and the node receiving a data frame arrives the optimal communication link of the next hope and sends the data of the source node to a target node after multiple hops. By adopting the frequency coordination and allocation method provided by the invention, the node can fully master the channel quality of several channels thereof and find the channel with the optimal state, so that the hops of the multi-hop vehicular ad hoc network are decreased, and the communication quality and the communication efficiency are improved.