The invention discloses a fuzzy reasoning-based in-vehicle network routing establishment method which is mainly used for solving the problem that in the prior art, the data transmission performance is low due to the fact that a reliable communication link is not selected. According to the scheme, the method comprises the steps that 1, a network is initialized; 2, neighbor node movement information is acquired; 3, a source node sends a routing request packet; 4, node-to-node link reliability values are computed by means of fuzzy reasoning according to the step 2, and the link reliability values are updated; 5, whether a current node is a target node or not is judged, if yes, the step 6 is executed, and otherwise, the step 4 is executed; 6, the target node selects the communication link with the highest reliability value and sends a routing reply packet; and 7, whether a routing reply data packet reaches the source node or not is judged, if yes, a routing path is established to complete data transmission, and otherwise, the step 6 is executed. According to the method, the data packet delivery success rate of the network is increased, the network transmission time delay is shortened, the stability and high efficiency of the communication links are guaranteed, and the method can be applied to data communication.