The invention provides a method for generating a multi-base sonar multi-address distinguishing signals having low-interception-probability characteristics. The method comprises the steps that 1, mutual overlapping function frequency-axis maximum distances of Costas signals under the Doppler constraint condition are calculated; 2, the strict orthogonality requirements of the Costas signals of different transmitting bases and loose orthogonality requirements in the Costas signals of the same base are set; 3, the maximum mutual overlapping function matrix of the M-order Costas sequences is calculated; 4, the maximum mutual overlapping point number of the Costas sequences in the transmitting bases and the maximum mutual overlapping point number of the Costas sequences among the transmitting bases are calculated; 5, N groups of orthogonal Costas sequences sets are selected from the Costas sequences and are allocated to the transmitting bases; 6, a proper number of orthogonal LS codes are constructed and allocated to the transmitting bases; 7, Costas_LS codes are obtained. It can be ensured that detection signals have excellent low-interception probability, the detection signals among different transmitting bases have excellent orthogonality, and meanwhile the orthogonality of the detection signals in the same transmitting bases is improved.