本发明涉及水利工程技术领域，尤其涉及一种堰坝结构，包括：横跨河道的堰坝本体，堰坝本体的上表面开设有沿水流方向贯穿堰坝本体的凹槽；以及设于凹槽下游的多级拦水坎，多级拦水坎沿河道的上游至下游依次间隔设置，最上一级拦水坎与凹槽的槽底壁之间、相邻的上下两级拦水坎之间均具有高度落差，且最上一级拦水坎与堰坝本体之间、相邻的上下两级拦水坎之间均形成水流调节池。通过在堰坝本体的上表面开设凹槽实现了堰坝本体的过鱼功能，同时，通过在堰坝本体上的凹槽的下游布置多级拦水坎形成多级沿河道的上游至下游依次呈阶梯形落差布置的水流调节池，为鱼类提供了溯河洄游及上下游自由迁徙的路径。设计简单、后期运行维护和管理方便。

The invention relates to the technical field of water conservancy projects, in particular to a weir dam structure. The weir dam structure comprises a weir dam body stretching across a riverway, and multiple stages of retaining ridges arranged at the downstream of a groove, wherein the groove which penetrates through the weir dam body in a water flow direction is formed in the upper surface of theweir dam body; the multiple stages of retaining ridges are arranged in sequence in a spaced mode from the upstream of the riverway to the downstream of the riveryway; height fall exists between the retaining ridge of the uppermost grade and the groove bottom wall of the groove, and height fall exists between upper and lower adjacent stages of the retaining ridges; and a water flow regulating tankis arranged between the retaining ridge of the uppermost stage and the weir dam body, and a water flow regulating tank is formed between upper and lower adjacent stages of the retaining ridges. A fishpassing function of the weir dam body is realized by forming the groove in the upper surface of the weir dam body; meanwhile, the downstream of the groove in the weir dam body is provided with multiple stages of retaining ridges to define multiple stages of water flow regulating tanks which are sequentially arranged in a step fall mode from the upstream to the downstream of the riverway, so thatan anadromous migration and upstream-downstream free migration path is provided for fish. The weir dam structure is simple in design, and is convenient in later-period operating maintenance and management.