Method and device for analyzing rail transit data based on link mapping

The invention provides a method and a device for analyzing rail transit data based on link mapping, the rail transit data is obtained by packaging based on a safety communication layer protocol and anapplication layer protocol, and the method comprises the following steps: capturing the rail transit data transmitted by a train control system based on communication through a network by using a packet capture tool; analyzing the rail transit data in a transport layer, a network layer and a network interface layer by using the packet capture tool to obtain unanalyzed data and link information ofthe rail transit data, the link information comprising a source IP address, a source port, a destination IP address and a destination port; querying a pre-stored configuration file to obtain a protocol parser mapped by the source IP address, the source port, the destination IP address and the destination port; and calling the obtained protocol parser to parse the unanalyzed data. The analysis efficiency of the rail transi