The CdS/ZnO-ZnFe2O4 composites (CdS/Zn-Fe LDO) were prepared by high-temperature roasting with complex using the method of precipitation CdS and zinc iron layered double hydroxides (Zn-Fe LDH).The structure, morphology and optical properties of the composite were characterized by XRD, SEM, UV-Vis DRS and PL. The photodegradation of malachite green by CdS/Zn-Fe LDO was studied under visible light. The experimental results showed that the photocatalytic degradation capacity of CdS/Zn-Fe LDO composites were higher than CdS or Zn-Fe LDO. The photocatalytic activity of m(CdS) : m(Zn-Fe LDH)=1 : 1 (CdS/Zn-Fe LDO（1:1）) was the biggest among composites. The degradation rate of malachite green was 96.6% under the optimal conditions of 20 min, initial concentration 20 mg/L, CdS/Zn-Fe LDO (1:1) dosage of 20 mg as well as visible light. Furthermore, the composites also degraded other dyes such as, rhodamine b, methylene blue, methyl orange and crystal violet. The kinetics of photodegradation reactions were followed with pseudo first order kinetic.