The invention provides a message processing method and device. The method comprises that whether an unknown unicast message exists in a present message queue is detected; if the first message in the present queue is detected to be the unknown unicast message, a CP transmits an unknown unicast notification message to a target dataflow terminal RP of the first message continuously; a first preset message sent from the target RP is received, and the first preset message is the preset message which is sent to a source RP of the first message when the target RP receives the unknown unicast notification message sent from the CP; and the CP studies the MAC address in first preset message. According to the method and device, when an MAC item is cleared due to link oscillation, the unknown unicast message can be changed into a known unicast message, and QCN technology support is provided for subsequent links when congestion occurs.