An efficient and convenient method was developed for the preparation of 3-sulfenylindoles via a cellulose-derived Fe3O4@Pd NPs catalyzed heterogeneously C-H sulfenylation of indoles. This approach provides an effective synthetic route to an important class of indoles derivatives and features high efficiency, easy operation, good practicality, and environmental friendliness. The recoverable catalyst was separated from the reaction mixture using an outside magnetic field and can be recycled five times without huge loss of catalytic performance.