The invention discloses a system and a using method thereof for identity authentication of an automobile electronic license. The system comprises a license monitoring device, an engine monitoring device, a central processing device, a GPRS module and an SIM card. A pressure sensor in the license monitoring device collects a pressure value between the license and an automobile license bracket, andthe central processing device monitors the changing of the pressure value, so as to judge whether the license is privately changed; a position tracking sensor in the engine monitoring device scans the position of an engine so as to judge whether the engine is privately changed; the GPRS module sends information sent by the central processing device and automobile identity information stored on the SIM card to a vehicle management center through a GPRS network, so as to monitor and manage the information about the license, type, position and the like of an automobile in real time, thereby achieving the purposes of accurately identifying the license, preventing the impersonation of the license of other people and preventing the assembled automobile.