The invention provides a water conservancy construction water drainage structure and a construction technology thereof. The water conservancy construction water drainage structure comprises a metal hose, a discharge pipe, a connecting pipe head, a filter cartridge, a filter screen, a detachable cover, a support pipe, a drainage hose, a water conservancy construction foundation, a water conservancy drainage foundation, a dustproof protection buckle cover structure, a detachable anti-blocking crusher structure, an angle-rotatable adjusting quantity control plate structure and a buffer type construction fixing seat structure, one end of the metal hose is in threaded connection with the left end of the discharge pipe, and the other end is in threaded connection with the right end of the connecting pipe head; and the connecting pipe head is in threaded connection with the right end of the filter cartridge. According to the water conservancy construction water drainage structure, by arranging a lifting ring, the dustproof protecting cover, a sealing ring, a drainage inlet pipe, a drainage pipe, a fixing column and the hollow seat, the dustproof protection effect can be achieved when drainage is not conducted; according to the water drainage structure, through the arrangement of a drainage cylinder, a blocking base, an anti-blocking filter screen, a connecting pipe, a crushing shaft, a crushing motor and a crushing blades, anti-blocking crushing operation can be conducted, and the drainage stability is guaranteed.