The utility model discloses a system is shared in accurate measurement of charges of electricity that multi -user shared under ammeter scene, include: smart electric meter terminal, control terminal and an at least user electrical card, control terminal includes: communication module, data storage module and FRID read/write module, data storage module and communication module and FRID read/write module carry out both -way communication respectively, communication module carries out both -way communication with the smart electric meter terminal, a FRID read/write module and an at least user electrical card carry out both -way communication. The utility model discloses beneficial effect: the utility model discloses on current smart electric meter's basis, increase an external control terminal, control terminal adopts external mode rather than the built -in smart electric meter of arriving, and current smart electric meter need not be changed to the advantage, has stronger suitability, also need not change current structure and working method of copying meter system.