The invention relates to a bracket type solid magnet yoke of a water-wheel generator, comprising a rotating shaft (3), a wheel hub type rotor bracket (2) and a magnet yoke (1), wherein the wheel hub type rotor bracket (2) is in shrinkage fit with the wheel hub type rotor bracket (2); the magnet yoke (1) is sleeved outside the wheel hub type rotor bracket (2); the wheel hub type rotor bracket (2) is uniformly provided with at least four support arms (2a) along the circumference, and the surface of a rotor bracket excircle (2b), which corresponds to the positions of the support arms (2a) is processed with first key slots (2c); the magnet yoke (1) comprises a group of coaxial stacked magnet yoke rings; a group of inner surfaces inside the magnet yoke rings, which are arranged corresponding to support arms (2a), are processed with studs (5) of second key slots (5a); spacing supporting blocks (8) are arranged between every two stacked magnet yoke rings; a wind guide plate (7) is arranged outside each spacing supporting block (8); and taper keys (4) are inserted between the first key slots (2c) and the second key slots (5a). The invention is used for large-dimensional motor without processing T tails by large-sized tools and dies and high-tonnage punch presses and has low processing cost and easy installation.