The artificial waterfall generating device comprises a bottom frame, a turnover water guide plate mechanism, a water spraying structure, a water tank, a water supply pipe, a water drain pipe and a groove type hoop. The bottom frame is provided with a supporting frame used for supporting the water spraying structure; The turnover water guide plate mechanism comprises a turnover plate, a rotating shaft, hoisting equipment and a supporting stand column; The supporting stand columns are fixedly connected with the bottom frame. The hoisting equipment drives the turning plate to rotate around the rotating shaft; The water spraying structure comprises a water spraying pipe, a valve and a nozzle; An open water inlet is formed in one end of the water spraying pipe, and a water drainage opening is formed in the other end of the water spraying pipe and communicated with the water drainage pipe; A valve is arranged at the water spray pipe close to the drain opening; flowing water firstly passes through the valve and then flows to the drain opening to reach the drain pipe; The nozzle is arranged on the horizontal section of the water spraying pipe; A pipeline pump is arranged on the water supply pipe, the water supply pipe is communicated with the water pool, and water flows to the water pool through the turnover water guide plate mechanism. According to the device, a vivid waterfall landscape can be built according to dramatic needs, and performance atmosphere is set up.