Magnetic phosphazene-containing polymer nanotubes were successfully prepared via a facile approach at room temperature by ultrasonic irradiation. The structure and morphology were characterized by XRD, EDX, SEM and TEM. The characterization results show that the phosphazene-containing polymer nanotubes are 50–80 nm in outer diameter and 5–10 nm in inner diameter; the Fe₃O₄nanoparticles loaded on the outer surface are 5–10 nm in diameter. The coordination behaviour between magnetic nanoparticles and PZS nanotubes was investigated by IR. TG curves show that the magnetic nanotubes have good thermostable properties and high magnetism content. The magnetic properties of the Fe₃O₄/polymer nanotubes were also investigated. The results show that the magnetic nanotubes have high magnetization saturation value and exhibit good superparamagnetic properties.