Anti-collision drainage device suitable for bank slope type wharf in high-incidence debris flow disaster area

The invention belongs to the field of bank slope wharfs in high-incidence debris flow areas, and particularly relates to an anti-collision drainage device suitable for a bank slope wharf in a high-incidence debris flow disaster area. The device comprises a drainage groove, a low-water-level platform, a lap joint platform A, a high-water-level platform A, a hydraulic cylinder and a high-water-level platform B, wherein the drainage groove formed in the mountain slope is located in the center position under the low-water-level platform, the lap joint platform A, the high-water-level platform A and the high-water-level platform B. When the flow is larger than the maximum design flow of the drainage groove, the high-water-level platform B can avoid the debris flow which overflows and flows downwards, so that the situation that the wharf composed of the low-water-level platform, the lap joint platform A, the high-water-level platform A and the high-water-level platform B hinders the debris flow and is damaged is av