The invention belongs to the field of ceramic products, and particularly relates to a Dehua high whiteness porcelain and a preparation technology thereof. The Dehua high whiteness porcelain prepared with the preparation technology comprises a high whiteness porcelain green body and high-transparency glaze, wherein the high whiteness porcelain green body is prepared from Dehua kaolin, clay, potassium feldspar and quartz at a ratio; the high-transparency glaze is prepared from the potassium feldspar, the quartz, limestone and Dehua kaolin at a ratio; the chemical component of each raw material is strictly controlled, a four-stage method is adopted to carry out high-temperature reduction to sinter the Dehua high whiteness porcelain, and the porcelain achieves high whiteness. Through measurement, the whiteness of the Dehua high whiteness porcelain is 85-90 degrees, the density of the Dehua high whiteness porcelain is 2.5g/cm, the water absorption of the Dehua high whiteness porcelain is less than 0.05%, and the transparency of the Dehua high whiteness porcelain is greater than 20% (1mm). The Dehua high whiteness porcelain has the advantages of exquisite porcelain, compactness, high transparency and high whiteness and has an artistic effect which is most similar to traditional Dehua high whiteness porcelain, and has a positive meaning for protecting and inheriting the chinaware which has a traditional Dehua high whiteness porcelain effect.