The utility model relates to a motorless fan for supplied and exhausted air and air quantity control mechanism which is mainly composed of a leak-proof outer shell, a water inlet, a nozzle, a waterwheel wing panel, a big and a small shaft centers, a windmill (fan), a total-sealing ball bearing, a control valve, a communication valve, etc. The utility model which is not driven by the motor makes use of high rise building to generate a water head or a circulation pump to generate hydraulic to drives the waterwheel wing to generate air quantity, makes use of the motorless fan for supplied and exhausted air of a water (oil) sealing device with small friction force and a minimal leakage, and makes use of a simple and practical multi-point multi-section control valve to adjust air quantity.