After the tunnel-shield-driving machine excavated through the north levee of Yangtze River, several transverse construction cracks appeared in the river embankment, and the accumulative settlement of the embankment was large. This paper considered the influence of the cracks in the embankment construction of different depths on the seepage and slope stability of the Yangtze River embankment. Based on the saturated-unsaturated seepage finite element method and the Sweden slice method, the seepage and slope stability analysis models of the embankment in the tunnel crossing section were established to calculate the seepage behavior and slope stability of the embankment under different crack depths, when the river level was the highest in history. The results show that the deep mixing pile has significantly reduced the water head and reinforced the slope of the embankment. The through cracks have great influence on the seepage field of the stratum around cracks. When the crack depth is less than 8. 5 m, the maximum seepage gradient of dam foundation and body is 0. 181 and 0. 206 respectively, which is less than the allowable seepage gradient of the corresponding soil layer. Therefore, the seepage stability of the embankment satisfies the requirement. Moreover, the influence of location and depth of through cracks on the slope stability of the embankment is obvious. When the crack depth is 8. 5 m, the safety factors of slope under two different positions of through cracks are 2. 419 and 1. 844 respectively after the reinforcement of deep mixing piles. The slope stability of the reinforced embankment with deep mixing piles can meet the standard requirements when the crack depth is less than 8. 5 m.