Anti-blocking drainage device for hydraulic engineering construction

The anti-blocking drainage device comprises an outer box, a cushion frame, a water inlet pipe and a transition cover, the upper side of the outer box is fixedly connected with a first box door through a hinge, the cushion frame is arranged on the lower side of the outer box, the rear side of the outer box is fixedly connected with the water inlet pipe through a bolt, and the water inlet pipe is fixedly connected with a second box door through a bolt. Through the arrangement of the transition cover, the expansion rubber strip and the filter disc, not only is the structure simple and is convenient to disassemble, assemble and clean, but also the filter disc can intercept larger impurities in flowing water to prevent the blockage phenomenon, and through the arrangement of the collection box, the extension pipe, the discharge hopper and the brush filter head, the filter disc is convenient to clean, and the filter disc is convenient to use. When flowing water enters the collecting box through the water outlet end