The invention discloses an intelligent statistical system and a method based on on-line big data, wherein, the intelligent statistical system based on on-line big data is characterized in that the intelligent statistical system comprises a system management module, a data receiving module, a file management module, a data statistics module, a data analysis module, a data storage module, a query module, a statistical file and a data file. An intelligent statistical method based on online big data is characterized in that the intelligent statistical method comprises an online data statistical method and an intelligent data analysis method; The data statistics module can generate statistical algorithms and obtain statistical results, does not require developers to modify codes according to statistical requirements, reduces the realization time of statistical requirements, and reduces the cost; The data analysis module adopts the idea of classification analysis, facilitates the informationization management, improves the efficiency of the informationization management, improves the utilization quantity and the utilization efficiency of the resources, helps the user to make the correctjudgment, and has high application value.