The Zn0.5Cd0.5S material holds significant promise for employment in photocatalytic hydrogen evolution. However, it face an issue of photogenerated electrons, resulting in an elevated rate of photogenerated electron-hole recombination. To tackle this challenge, we propose a remedy utilizing a dual built-in electric field. This is accomplished by leveraging the distinct properties of graphdiyne, which can serve as either an electron donor or acceptor. To create the dual built-in electric field, we first grow a thin layer of graphdiyne on the surface of Nano Cu, forming the first layer. The subsequent layer consists of another graphdiyne thin layer combined with Zn0.5Cd0.5S. Upon exposure to light, Zn0.5Cd0.5S produces a substantial number of photogenerated electrons, which can swiftly move under the influence of the dual built-in electric field. In experiments conducted under square meter conditions with a reaction environment of 0.35 M Na2S and 0.25 M Na2SO3, hydrogen evolution reached a production quantity of 106,689 µmol within 30 h. In another experiment conducted with original natural water from the Yellow River, the production quantity amounted to 334 µmol within 84 h. Under 5 W simulated sunlight and 108 hours in pure water, 178 µmol of hydrogen and 50 µmol of oxygen were generated.