Water hammer protection device suitable for long-distance water delivery system

The water hammer protection device suitable for the long-distance water conveying system comprises an outer pipe, an inner pipe is connected to the interior of the outer pipe, the inner pipe and the outer pipe are coaxially distributed, rotating plates are installed on the outer wall of the inner pipe, and the rotating plates are located on the inner side and the outer side of the inner pipe at the same time. The final water hammer effect is prevented by weakening the acting force of follow-up water, when the water hammer effect occurs, water flow of the first few waves normally penetrates through the inner pipe and continues to flow forwards along with backflow of the second few waves, and the water flow of the first few waves starts to reversely flow into the gap between the inner pipe and the outer pipe and will impact the rotating plate, so that the rotating plate is driven to rotate. The rotating plate is arranged in the inner pipe, so that the rotating plate is integrally vertical downwards, water enter