Abstract: Taking F6201 mining area of Buliangou Coal Mine as the engineering background, adopting the valley slope angle 60° model test and numerical analysis method to study the influence of the valley slope angle on the overlying strata movement and the development of water flowing fractured height in shallow-buried and extra-thick coal seams, the study shows that: the migration laws of roof overburden were controlled by the main sub-key strata: when the working face advanced to 112.5 m, five periodic collapses occurred in the sub-key layer 1, with a height of 15 m, which was consistent with the experience value of 16.5±2.2 m of the large mining height; when the working face advanced to 120 m, the sub-critical layer 2 collapsed, with a height of 37.5 m; at this time, the main key stratum and the sub-key stratum 3 collapsed synchronously, and the overall collapse height was 64.5 m; the water-spraying fractures developed on both sides of the valley, with height of 63 m and 81 m; the development height of water flowing fractured height increases with the increase of the slope angle of the valley, and was divided into two regions by the slope angles ≤30°and ≥30°; the development height of the water flowing fractured with a slope angle of 60° in the valley was 95 m, which was in agreement with the total height of 102 m.