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[en] We have studied the dielectric properties of YbFe2O4 single crystals, which exhibits ferroelectricity due to charge ordering. The dielectric constant of both the c-axis and ab-plane exhibit a large dielectric dispersion, and is greatly suppressed by applying a small DC bias electric field, which leads to a giant dielectric tunability. Due to the layered structure, a strong anisotropy between the c-axis and ab-plane is observed in the dielectric constant, tunability, and loss tangent. The origin of the giant dielectric tunability and dielectric loss is discussed based on the nature of electronic ferroelectricity.