The invention discloses a water conservancy irrigation device based on solar power generation. The water conservancy irrigation device structurally comprises a mounting piece, a water guiding pipe, anautomatic dredging sprinkling device, a triangular supporting frame, a three-way pipe, a base plate and a solar energy conversion waterproof casing. The lower end of the automatic dredging sprinklingdevice is embedded and installed at the upper end of the solar energy conversion waterproof casing and positioned on the same axis. The upper end of the water guiding pipe is embedded and installed at the lower end of the solar energy conversion waterproof casing and positioned on the same axis, the water guiding pipe passes through the upper end of the triangular supporting frame, the lower endof the triangular supporting frame is embedded and mounted at the middle of the mounting piece, and the lower end of the water guiding pipe is embedded and mounted in the upper end of the three-way pipe and is perpendicular to the upper end of the three-way pipe. According to the water conservancy irrigation device based on solar power generation, a blocked spray head can be quickly dredged through solar automatic power storage, the loss caused by the failure to timely irrigate crops resulting from the blockage of the spray head is reduced, a chemical adding mechanism is arranged, required chemicals can be placed in the device, and automatic chemical adding for spraying can be performed automatically.