The invention aims to provide a pollution-free reverse-rotation-preventing waterwheel power generating device using pushing force of sea waves and rivers and integrating power generation and cultivation. The pollution-free reverse-rotation-preventing waterwheel power generating device comprises a waterwheel, a water flow push plate, a bearing, a gear transmission, a power generator, a floating plate, waterwheel floating cans, a reverse-rotation-preventing gear, a reverse-rotation-preventing device and a fishing net. The pollution-free reverse-rotation-preventing waterwheel power generating device has the advantages that device can be arranged an optional place with large water flow, the position of the waterwheel can be adjusted according to water level, gear friction speed is increased through the gear transmission to keep the power of the power generator, the waterwheel can be prevented from rotating reversely, fish can be cultivated on the lower portion of the waterwheel, and the device is convenient to mount and easy to implement.