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Nanoparticles are nanostructures with at least one dimension being less than 100 nm. In this research, nanomagnetic Fe 3 O 4 @Collagen was prepared and characterized by Fourier transforms infrared spectroscopy (FT-IR) spectra, Scanning electron microscopy (SEM) images, energy dispersive X-ray spectroscopy (EDX) spectra, X-ray diffraction (XRD) measurements. Fe 3 O 4 @collagen is a new and green nano catalysis and using in synthesis of benzimidazoles and benzothiazoles. This method offers several advantages including high yields, short reaction times, easy work up procedure, reusability of catalyst and environmentally benign reaction conditions.