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The invention discloses a time-varying ocean channel modeling method. The method comprises: (1), calculation is carried out by using a sound ray propagation path obtained by a Bellhop model and ray acoustical simulation software to obtain an impact response of a channel and the obtained impact response is used as an initial value of the channel impact response in time-varying channel modeling; (2), a time-varying underwater acoustic channel updating based on a data block length is established, a statistical characteristic, changing with time, of an ocean channel impact response h(t) is obtained, statistical characteristics, changing with time, of an ht and an h t+tau after sampling according to a symbol rate are studied, and a data base of statistical parameters is established; and (3), underwater acoustic channel changing situations can be classified into a situation of unchanging of the structure of the h t+tau relative to the structure of the ht and a situation of changing of the structure of the h t+tau relative to the structure of the ht; and when the structure of the ht does not change, the h t+tau updates the channel by the correlation degree of the channel changing with time in the database; and when the structure of the ht changes, a new sparseness factor is generated again and the channel is updated. According to the invention, with the established time-varying underwater acoustic channel statistic model, the ocean underwater acoustic channel can be recovered well and thus the sparse characteristic of the underwater acoustic channel can be reflected accurately.