The invention discloses foam copper ferrite/graphene oxide as well as a preparation method and application thereof. In the foam copper ferrite/graphene oxide, foam iron is used as a substrate; copper ferrite and graphene oxide are grown on the surface of the foam iron substrate. The invention provides the application of the foam copper ferrite/graphene oxide in adsorbing and removing arsenic in a water body; the foam copper ferrite/graphene oxide has remarkably strong adsorbing power on the arsenic in the water body as well as better cycling performance.