The utility model discloses a storage battery fills discharge current monitoring system, it is including charging machine and storage battery, the first direct current that direct current end and thestorage battery of machine of charging fills discharge current monitoring devices is held and is connected, storage battery fills discharge current monitoring devices's second direct current end and is connected with storage battery's direct current end, machine and the storage battery of charging fills between discharge current monitoring devices's the communication interface through with ethernet or RS485 connection, the problem of prior art fill discharge current monitoring to storage battery and adopt single measurement element to be difficult to satisfy so wide measuring range's requiredprecision, single measurement element reliability is relatively poor moreover is difficult to satisfy the techniques such as requirement of transformer substation to filling discharge current real -time supervision is solved.