Tax source monitoring system and method thereof

The invention provides a tax source monitoring system and a method thereof. The system comprises a data acquisition unit, a master control unit, a tax control cluster management unit and an invoice providing unit, wherein the data acquisition unit is used for receiving sales data of a POS (Point Of Sale) and carrying out encryption processing according to key data in the sales data to generate a tax control identification code; the master control unit comprises a database server, is connected with the data acquisition unit and is used for receiving the sales data and the tax control identification code of the data acquisition unit, carrying out processing on the sales data and storing the processed sales data and tax control identification code into the database server; the tax control cluster management unit is connected with the master control unit and is used for completing functions of declaring dutiable goods and delivering duty paid; and the invoice providing unit is connected with the master control unit and is used for extracting the sales data corresponding to the tax control identification code on a purchasing bill and printing the corresponding sales data onto a tax control invoice. According to the invention, the existing tax control management system is not changed and the monitoring on the sales data is completed by matching of the data acquisition unit and a fiscal processor.