The utility model relates to a data signal return system of a wired television interaction platform. The traditional set top box capable of receiving coaxial cable network transmission downlink signals are mostly one-way set top boxes at present, the set top box is used as the terminal equipment and has no function of signal return. The utility model provides the data signal return system of the wired television interaction platform, comprising an interaction television head end, a set top box for receiving interaction television head end downlink signals and a serial port network adapter. The serial port network adapter is connected with the set top box, converts the control signals of the set top box into IP (internet protocol) data signals and returns the IP data signals to the interaction television head end through the network. In the utility model, the return function of the set top box is completed through the serial port network adapter without newly implementing the return network. The utility model has the characteristics that data signal return system is simple and practical and saves resources.