The ionization process of atoms in infrared (IR) and extreme ultraviolet (XUV) two-color laser field is one of the hot topics in strong field physics. By using the frequency-domain theory based on the nonperturbative quantum electrodynamics, we investigate the above-threshold ionization process of atoms subjected to elliptically polarized IR+XUV two-color laser field. The results show that the photoelectron energy width of each plateau can be controlled by the polarization \eta_1 of the IR laser. Specifically, for emission angles less than 45°, the photoelectron energy width decreases as the value \eta_1 increases, whereas for angles more than 45°, it increases with the value of \eta_1 increasing. Furthermore, when the XUV laser changes from a linearly polarized field to a circularly polarized field, the ionization probability increases. Additionally, the energy width of photoelectrons broadens with the intensity of the IR laser increasing, while the ionization probability increases with the intensity of the XUV laser increasing, and the distance between the two plateaus increases with the frequency of the XUV laser increasing. Meanwhile, the energy range of photoelectrons, as a function of emission angle, laser polarization, intensity and frequency, is predicted by using the classical energy orbital formula satisfied by electrons in the process of ionization. These predictions are in agreement with quantum numerical results. This work provides theoretical support for the experimental study of the ionization process of atoms and molecules in IR+XUV two-color laser fields.