The invention discloses a power generator unit. The power generator unit comprises a unit shell. The unit shell is provided with a water tank. One end of the water tank is provided with a water inlet,and the other end of the water tank is provided with a water outlet. An impeller is arranged in the center of the unit shell through a rotary shaft. The impeller is uniformly provided with two circles of mounting through holes. A plurality of connecting arms are installed through the mounting through holes. The tail end of each connecting arm is movably connected with a blade through a rotating shaft. A speed changer is fixedly arranged at the center of the impeller. The speed changer is connected with a power generator though a transmission belt. The power generator is arranged on a motor platform. The motor platform is fixedly arranged on the speed changer. Through the power generator unit, water just needs to have flowing potential energy, and gravity potential energy generated from the terrain is not needed; limitation of the geographic position to hydraulic power generation equipment is greatly reduced, and the construction practicality of the hydraulic power generation equipmentis improved.