Abstract: Provided are a structure for controlling crack generation in a large-volume sluice gate and a construction method therefor. The structure includes: a sluice floor and a pier, the sluice floor and the pier are formed by a process of pouring concrete, and the pier is disposed above the sluice floor; at least one cavity, defined in the pier, the at least one cavity is reserved in the process of pouring the concrete, and the at least one cavity serves as a self-restraint stress hole; and a tough material, the tough material is configured for stress absorption, the tough material is filled in the at least one cavity, and the tough material is integrated with an inner wall of the at least one cavity. The construction method includes: performing construction preparation; performing foundation treatment; performing construction of the sluice floor; and performing construction of the pier.