The invention provides a bridge intelligent diversion traffic system and a bridge intelligent diversion method, and relates to the technical field of bridge diversion. The bridge intelligent diversiontraffic system comprises an image acquisition device, a signal lamp control system, an alarm system, a data transmission server and a cloud server. The image acquisition device is in communication connection with the data transmission server. The data transmission server is in communication connection with the cloud server. The cloud server is in communication connection with the signal lamp control system and the alarm system. Compared with the prior art, the bridge intelligent diversion traffic system can reasonably divert vehicles entering the bridge, prevents the bridge against serious congestion, and can promptly remind coming vehicles of the congestion state of the bridge.