The invention discloses a method and device for avoiding carrier sensing conflicts. According to the method and device, the conflicts in multiple paths of access are reduced, and the utilization rate of a bus is improved. The method includes the steps that messages sent by a site carry site messaging priority information; after the site receives messages carrying opposite-end site messaging priority information sent by an opposite-end site, the opposite-end site messaging priority information carried in the messages is compared with the site messaging priority information, the site with the high messaging priority sends the messages preferentially, and the site with the low messaging priority sends the messages after a period of delay time. The device is located on sites and comprises a priority information sending module and a conflict avoiding module. By the adoption of a scheme for avoiding the conflicts, by utilizing monitored messages, message fields are used for decision-making between the two conflicted sites, only one site is allowed to instantly send the messages, and the other site waits for sending the messages, and therefore the conflicts are avoided.