The invention relates to a remote upgrading method for a vehicle-mounted communication terminal. The method comprises the following steps that 1, a background server issues a new version of a terminal; 2, the background server sends an upgrading inform to a mobile phone App end; 3, the mobile phone App end receives an upgrading selection sent by a user; 4, the background server sends new version software information to the terminal; 5 the background server authenticates the identity legality of the terminal; 6, the terminal downloads an upgrading patch; 7,upgrading patch legality and integrity are checked; 8, whether a vehicle has the upgrading condition or not is judged; 9, the terminal is remotely upgraded; 10, a new version program is installed for the terminal; 11, the terminal judges whether operation of new version software is normal or not is judged; 12, an original version program back-up patch is deleted, and the new version program is backed up; 13, the number of the new version software is reported to the background server; 14, the mobile phone App end prompts the user to upgrade information. The safety problems in the upgrading process in the prior art are solved.