The invention relates to the field of track transportation, and discloses a train energy-saving running chart optimization system and method. The system comprises an information acquisition unit, a data storage unit and a data mining unit, wherein the information acquisition unit is used for acquiring train information, and the train information contains a locomotive type, a grouping way, a train energy consumption loss and a train running time; the data storage unit is used for storing the train information; the data mining unit is used for reading the train information and analyzing the train information to obtain a relational expression including the locomotive type, the grouping way, the train energy consumption value and the train running time and calculating the train running time corresponding to the train energy consumption value according to the relational expression. By utilizing the train energy-saving running chart optimization system and method, reference data can be provided for fabricating a train energy-saving running chart, so that a more-economic train running scheme can be fabricated.