The utility model discloses a water collecting well system, particularly discloses a water collecting well system for a powerhouse, and belongs to the technical field of design and construction of water buildings. By means of the water collecting well system for the powerhouse, all volumes and pump drainage capacity of a leakage water collecting well and an overhaul water colleting well can be given to full play under emergencies, so that special working conditions such as water logging of the powerhouse are avoided. The water collecting well system comprises the leakage water collecting well and the overhaul water collecting well, and further comprises a collected water transfer and delivery structure, and the two ends of the collected water transfer and delivery structure are communicated with the leakage water collecting well and the overhaul water collecting well respectively; when the water level of collected water in the leakage water collecting well exceeds a warning line, the collected water is input to the overhaul water collecting well through the collected water transfer and delivery structure.