It is extremely desirable to develop efficient and cheap water splitting photocatalysts. An ultrahigh performance and stable water splitting photocatalyst g-C3N4/ZnCdS was prepared by simple sintering method. g-C3N4 nanosheets are evenly distributed around ZnCdS nanoparticles of 20-30 nm by forming C-S bond, which can accelerate carriers separation and reduce the carrier’s life-time from 5.5 ns to 4.10 ns. The photocatalyst has a high photocatalytic hydrogen evolution rate of 16663 μmol•h-1•g-1 under visible light illumination (λ = 400-780 nm). UV-vis absorption spectra demonstrate that their absorption range can reach to visible light edge of 539 nm. Furthermore, after three recycles of photocatalyst, the hydrogen evolution stability still remains 94%. The excellent photocatalytic performance can be attributed to the Z-scheme energy band structure formed between g-C3N4 and ZnCdS with C-S bond by sintering method. This work provides significant progress toward the synthesis of cheap Z-scheme photocatalysts for practical applications.