The coupling process of the earth system is the key research content of earth surface system at present. Wetland is an important ecosystem on the earth surface. Wetland soil is under anaerobic conditions seasonally or perennially because of waterlogging, where the redox of Fe and N can be coupled by microbiology. The coupling process lies in three aspects: the microbial coupling of NO(3-)-reduction and Fe(2+)-oxidation, coupling of Fe(3+)-reduction and NH(4+)-oxidation and the interaction of NO3- and Fe3+ during reduction. Getting the knowledge of the coupling process has important significance to understand the cycles of Fe and N in wetland soil. The article reviews the research status of the three aspects. In general, we have a comparatively deep understand of the coupling process of NO(3-)-reduction and Fe(2+)-oxidation than the latter two aspects. The research of microbial mechanism of the coupling process of Fe(3+)-reduction-NH(4+)-oxidation and the comprehensive evaluation of the environmental significance of coupling process of Fe and N in wetland soil should be strengthened in the future research, and then it can provide evidence for wetland protection and management.