The invention discloses a system and method for real-time inquiring of train dynamic information. The system comprises a user registration module, a user position sharing module, a train position inquiring module, a train dynamic information displaying module, a train dynamic information push module, a user database, a train operation route space database and a train operation time database. The method comprises the following steps of based on the train operation route space database and the train operation time database, judging the sharing position information of users, so as to form a position sharing information set of the users in a train; through a method of analyzing geographic information, calculating out a geometric center of all the positions, and using the geometric center as the current position of the train; utilizing geometric space analysis, based on the train time database and the train operation database, calculating actual time of the train arrives each station, the information for judging whether the train is late or not and the like; providing a service for real-time dynamic information inquiring of the train and a service of user cooperation question and answer for the users; and providing a systematical train position push service for VIP users in the train.