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Immobility of copper on magnetic nanoparticles was performed using surface rectification of Fe3O4 with Agar. The magnetic Fe3O4@Agar-Cu nanocatalyst was prepared and entirely characterized by different analyses such as Fourier transform infrared (FT‐IR), X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), energy dispersive X-ray (EDX), thermogravimetric (TGA), and inductively coupled plasma (ICP). The nanocatalyst was applied in C-N bond formation through the cross-coupling reaction of aryl halides with primary or secondary amines in water as a green medium known as the Buchwald-Hartwig reaction. The results of the Buchwald-Hartwig reaction by Fe3O4@Agar-Cu magnetic nanoparticles as catalyst demonstrate excellent activity and stability in water. Moreover, this catalyst can be recycled several times without considerable loss in its activity.