The invention discloses an MAC protocol realization method for a navigation sensor network based on dual-priority, and relates to the technical field of wireless communication. According to the protocol, communication service requests are distinguished into two kinds of periodic communication requests and on-demand communication requests, and the two kinds of requests are used for performing a periodic communication MAC sub-protocol based on a self-adaptation TDMA mechanism and an on-demand communication MAC sub-protocol based on a CSMA-CA mechanism; a dual-priority mechanism is employed in the protocol, on the one hand, service type priorities are set according to the types of communication services; on the other hand, data packet type priorities are set based on data packet types in different stages of the communication services; through adoption of the mechanism, the service requests with relatively high priorities are ensured to obtain access authority of channels, and further various services with different delay or packet loss demands are ensured to obtain communication with QoS guarantee. The method is applicable to remote QoS transmission of multimedia information of carriers such as vehicles, ships and aircrafts.