Water-saving water conservancy irrigation device

The invention relates to a water-saving water conservancy irrigation device which comprises a water inlet channel, a reservoir and a drainage channel which are sequentially communicated, a reinforcing block is arranged at the bottom of the water inlet end of the water inlet channel, a residue filtering net is vertically arranged at the water inlet end of the water inlet channel, the lower end of the residue filtering net is fixedly connected with the reinforcing block, and drainage gates are arranged at the joints of the water inlet channel and the reservoir and the joints of the drainage channel and the reservoir. A support is arranged at the top of the reservoir, a hydraulic oil cylinder is arranged on the upper end face of the support, a hydraulic telescopic rod at the lower end of the hydraulic oil cylinder penetrates through the support and is fixedly connected with the upper end of the drainage gate, a stand column is vertically arranged in the middle of the reservoir, a cross is arranged at the top of