The invention discloses a signal playback method for a signal playback module based on a ground load detector, and the method comprises the following steps that an FPGA receives a data signal from a main control computer through a PCIe bus, and the data signal is temporarily stored in a DDR buffer memory; the FPGA receives a triggering signal from the main control computer through the PCIe bus and starts the signal playback; the FPGA carries out the filtering and modulation of the data signal, and enables the data signal after filtering and modulation to be transmitted to a digital-analog conversion circuit; the digital-analog conversion circuit carries out the digital-analog conversion of the data signal, obtains an analog signal, and outputs the analog signal to a filter circuit; and the filter circuit filters out a spurious signal in the analog signal and enables the analog signal to be outputted to external equipment through two DA output terminals. The method can achieve the transformation and modulation of data rate of a specific data source, and outputs a radio frequency signal meeting the requirements of indexes.