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UiO-66-AO material was prepared by Aza-Michael addition and amidoxime reaction, and was well characterized by Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), and X-ray diffractometer(XRD). To evaluate the selective adsorption capacity of UiO-66-AO for U(Ⅵ) from radioactive wastewater, the adsorption experiment of U(Ⅵ) on UiO-66-AO was studied by batch adsorption technique. The effect of environmental conditions, such as solution pH, initial U(Ⅵ) concentration, and temperature were studied in detail. The experimental results show that the adsorption process reaches equilibrium in 4 h at pH=5, and follows the pseudo-second-order kinetic model. The maximum adsorption capacity of UiO-66-AO for U(Ⅵ) can reach to 244 mg/g at 55 ℃ and pH=5, and it can be well described by Langmuir isotherm adsorption model. In addition, UiO-66-AO has excellent adsorption efficiency for U(Ⅵ) in the presence of many other metal ions.