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This invention discloses a method and system for monitoring and early warning of debris flow ground motion, belonging to the field of geological disaster monitoring and early warning technology. The method includes: synchronously slicing continuous seismic records according to a unified absolute time axis, using waveform pairs from multiple stations as basic input units; independently encoding the signals from each station using a time-frequency hybrid encoder (STFT+LSTM-Transformer); constructing a spatiotemporal cost volume using a Lag-UNet module to achieve soft alignment of cross-station feature spaces; modeling four sets of feature interaction quantities using a causal TCN and outputting the probability of debris flow occurrence through attention pooling; and continuously sampling negative samples with replacement from a large-scale noise pool during the training phase using a dynamic sampling strategy.