The invention discloses a multi-source automobile security information processing method. According to the method, automobile security information from multiple sources is acquired, including owner complaint information and vehicle security correlation information; according to a preset automobile fault expert knowledge base, an automobile fault tag and a fault severity level of each piece of automobile security information are determined; according to all the owner complaint information and corresponding tags, clustering is performed on all the owner complaint information to form automobile fault cases; and according to all the vehicle security correlation information and corresponding tags, the vehicle security correlation information and the automobile fault cases are correlated to forman automobile fault case knowledge graph, and the automobile fault case knowledge graph can be used for automobile security risk level assessment. Thus it can be known that sources of reference information for automobile security risk assessment are enriched, and the reference value of the reference information for automobile security risk assessment is greatly raised.