Abstract: The excavation of a double-line shield tunnel will disturb the original stress balance state of the stratum, resulting in settlement of the soil above the tunnel. This has a significant impact on surface buildings and underground pipelines near the tunnel. In order to establish a prediction model for the soil settlement caused by the excavation of a double-line shield tunnel, the surface settlement and subsurface settlement during the excavation were analyzed. It was found that the soil settlement caused by the excavation of the second line was affected by the excavation of the first line. The maximum settlement value of the second line was greater than that of the first line and deviated from the tunnel axis. Based on the random medium theory, the wave propagation model was introduced to describe the settlement propagation mechanism of the soil above the tunnel during the excavation. The settlement calculation model of the soil was derived as a single tunnel excavating through Fourier transform. The disturbance influence factor of the first line excavation to the second line was defined, and the settlement model of the double line was established. Finally, the rationality of the model was verified using monitoring data. The results showed that when the first line has a large effect on the second line, the total settlement of the double line presented a single peak V shape, and the maximum settlement value was deviated to the side of the first line. When the effects of the first line on the second line were reduced, the total settlement of the double line showed a double peak W shape, and the deviation characteristics of the maximum settlement value were not obvious. The proposed model in this research has few parameters and is easy to determine. The model can not only predict the surface settlement caused by the excavation of a double-line shield tunnel but also can describe the subsurface settlement properties at different depths above the tunnel.