The invention discloses an Internet of vehicles clustering vehicle-vehicle multi-hop routing method based on particle swarm optimization. Through adoption of an elected criterion value calculation formula for cluster head election and a method that general nodes select and add a cluster, a cluster head and the general nodes can keep relatively stable, and particularly, the stability of an intra-cluster link can be improved. According to the method, path particle and speed coding rules are provided; a particle iteration rule is made; a fitness function is designed; and a parameter setting problem of a path particle swarm is solved. According to the method, through adoption of a method for searching boundary relay nodes, cross-cluster information interaction is relatively efficient.