The invention discloses a second-order data network e-commerce system which includes a client module, a multi-terminal network data transmission module, a first-order data temporary storage module, a data storage module, a data calibration module, a second-order data temporary storage module, and a main database. The multi-terminal network data transmission module includes data analysis, a network port, data sending, and rights management. The first-order data temporary storage module includes data maintenance and information distribution. The data storage module includes system management and security protection. The data calibration module includes data acquisition and information check. The second-order data temporary storage module includes information gathering and data compression. According to the second-order data network e-commerce system, large data can be transmitted through second-order temporary storage, which enables data to be secure in transmission, and accelerates data transmission. The calibration module added reduces data error. The user experience is enhanced. High security is achieved.