Data transmission system and data transmission method

The invention provides a data transmission system and a data transmission method. The data transmission system comprises a control center 11, wherein the control center 11 is connected with one or more subnets 13 through a major network 12; each subnet 13 is connected with at least one data acquisition equipment 14; the data acquisition equipment 14 is arranged in the field and used for collecting data information; the subnets 13 are used for obtaining the data information collected by the data acquisition equipment 14 and sending a data package containing the data information to the control center 11 through the major network 12. According to the invention, the control center is connected with one or more subnets, each subnet is connected with at least one data acquisition equipment, and the subnet obtains the data information collected by the data acquisition equipment and sends the data package containing the data information to the control center through the major network. In this way, the data informatio