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Due to poor visible light responsiveness and easy recombination of photo generated carriers, the photocatalytic performance of a single g-C3N4is limited. This article presents a Z-type Cu2SnS3/g-C3N4(CTS/CN) heterojunction photocatalyst prepared by in-situ growth of CTS on the surface of g-C3N4using a simple solvothermal method. Through SEM results, it can be seen that as the content of g-C3N4increases, the nanosheet gaps of flower shaped microspheres on the surface of CTS/CN increase and the size becomes thinner. The UV-vis DRS experiment showed that the introduction of CTS increased the visible light absorption range of CTS/CN composite and improved its visible light absorption ability.Under the synergistic effect of H2O2, the photocatalytic degradation efficiency of CTS/70% CN towards MO reached 99% at 50minutes，At the same time, the degradation rate constants k of methylene blue (MB), ciprofloxacin (CIP) and levofloxacin (LEV) reached 0.06289min-1, 0.02132min-1and 0.02787min-1respectively at 100min.In the synergistic MO system of H2O2for photocatalytic degradation, free radical capture experiments showed that the main active species were h+and • OH. Combined with the band structure of Cu2SnS3and g-C3N4, a Z-type photocatalytic mechanism was proposed. Under visible light, H2O2rapidly captured the photo generated electrons of CTS/CN, promoting the transport of photo generated carriers. This study provides theoretical guidance for the design and construction of Z-type heterojunctions with superior visible light driven photocatalytic performance.