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During seismic data processing, strong single‐frequency interference noise often affects data quality. Traditional methods for single‐frequency interference identification are typically conducted in the frequency domain, primarily by searching for abnormal peaks in the frequency spectrum of each trace. However, when the interference amplitude in the frequency domain is weak relative to the entire seismic frequency, the identification process becomes significantly more challenging. To address this issue, this article proposes a time‐domain approach for identifying single‐frequency interference. First, frequency analysis is performed on seismic data containing single‐frequency interference to obtain the initial frequency , and sine and cosine signals with an amplitude of 1 at this frequency are then generated. Next, the seismic data are normalized to balance amplitude differences across different datasets in the time domain. After normalization, deep‐time seismic data are cross‐correlated with the generated sinusoidal and cosine signals, and correlation coefficient R is computed to determine whether suppression is necessary. On the basis of theoretical simulations and field data analysis, suppression is considered necessary when R > 0.001. Finally, for identified single‐frequency interference, a hierarchical approximation method based on a cross‐correlation objective function is employed to search for interference frequencies with finer step sizes near the initial frequency and calculate the corresponding amplitudes. The interference signal is subsequently subtracted in the time domain to achieve interference suppression. Through synthetic experiments and the application analysis of various field seismic data (including single‐shot and stacked profiles), the proposed method demonstrates high efficiency and accuracy in identifying and suppressing single‐frequency interference.