In recent years, as global climate warming has intensified and extreme weather has become more frequent, the first-line tide gates in coastal areas have assumed an increasingly important function of flood control and moisture prevention. Due to the direct wind and wave attack, strong wind and waves, high tidal range, large span, and complex stress conditions, it is difficult to design the first-line tide gate. Taking Hainan Free Trade Port Haihuadao 1# Bridge Gate Project as an example, this paper introduces a new type of double-gate sluice, which optimizes the force-bearing structure of the sluice and improves the landscape of the sluice under the premise of ensuring the safety of moisture. Effectively, the project investment is reduced, and it is worthy of further promotion and application.