Self-flowing drainage system of water diversion tunnel maintenance channel of pumped storage power station

The invention discloses a self-flowing drainage system of a water guiding horizontal tunnel maintenance channel of a pumped storage power station. The self-flowing drainage system comprises a maintenance channel drainage ditch, a drainage steel pipe, a water collecting well and a drainage tunnel. Underground water in the diversion level tunnel maintenance channel can automatically flow through drainage ditches in the two sides of the maintenance channel bottom plate and be collected into the water collecting well, and leakage water of the diversion level tunnel maintenance channel permanent blocking body can automatically flow through drainage steel pipes embedded in the lower portion of the hollow gallery bottom plate of the permanent blocking body and be collected into the water collecting well. The water collecting well is located at the tail end of the maintenance channel permanent plugging body and connected with the gravity drainage tunnel arranged along the slope. And underground water collected in the