The invention discloses an accurate geographical method for monitoring data of a railway private mobile communication interface. The method comprises steps: a kilometer post, vehicle speed information, signaling information and measurement data of an Abis interface, signaling information of an A interface and the signaling information of a PRI interface are acquired; the mapping relationship between the kilometer post and longitude and latitude, the coverage section area of base station cells along the way and the corresponding relationship between the kilometer post and the longitude and thelatitude are determined through testing data of a railway private GSM-R testing device; and time sequence joint adaptation is carried out on the signaling information of three interfaces through time,in combination of the kilometer post and the vehicle speed information of the Abis interface, the mapping relationship between the kilometer post and longitude and latitude, the coverage section areaof base station cells along the way and the corresponding relationship between the kilometer post and the longitude and the latitude, geographical information adaptation between the measurement dataand the signaling information is carried out, and an adaptation result is outputted. In the above method, the interface monitoring data of a vehicle-mounted wireless communication device in operationcan be used as analog test data for analysis, so as to improve the accuracy and the efficiency of wireless communication system analysis.