The invention provides a method for realizing positioning of a naval ship by using communication satellite interference measurement. Radiation source signals of at least three communication satellitesare simultaneously received through a ground VLBI observation network, time delay difference of a satellite signal reaching each antenna is obtained, and precise orbit measurement is conducted on thecommunication satellites to obtain position information of the communication satellites; an array antenna is used on the naval ship to observe the same communication satellites, and time delay difference between the satellite signal reaching the naval ship and any measurement station in the VLBI observation network is obtained; and position information and clock difference of the naval ship are solved by a simultaneous positioning equation. The method does not depend on an existing satellite navigation system, the high precision positioning service of the naval ship can still be realized without affecting the service of the existing satellite navigation system, and the supplement and the backup of an existing positioning technology are formed.