A water turbine device is disclosed. The water turbine device includes a water shaft, a plurality of blade frames, a plurality of turbine blades, a pivot shaft and a blade control mechanism. The water shaft has a first axis. The plurality of blade frames are radially distributed around the water shaft. The plurality of turbine blades are mounted on the plurality of blade frames respectively. The pivot shaft is disposed on a corresponding one of the plurality of blade frames, has a second axis, and allows one of the plurality of turbine blades corresponding to the corresponding blade frame to be pivotally mounted on the corresponding blade frame. The blade control mechanism is disposed on an end opposite to the pivot shaft on the corresponding blade frame, wherein the turbine blade mounted on the corresponding blade frame has a stopper adjacent to the blade control mechanism.