The invention relates to a dual-mode signal acquiring board, belonging to the technical field of data acquisition. The acquiring board comprises a power supply module, a clock module, a power divider module, an ADC module, a multiplex allocation module, a data preprocessing module, a data caching module, a control interface module and a main control module, and can implement the functions of dual-mode data acquisition, multiple-triggering mode control, data caching, data preprocessing and data transmission, the invention solves the problems that the interchannel synchronization under GSPS dataacquisition velocity, multiple-triggering mode control, data preprocessing and transmitting, data caching clock network distribution are not easy to implement, the invention also solves the technicalproblem for implementing the interweave sampling of ADC chip of two GSPS sampling rates, the invention is suitable for the data acquisition conditions with high sampling velocity and input bandwidthrequirement being applied to SAR radar echo signal acquisition, radar signal spying receiving, frequency storing interference and software radio and so on.