The invention provides a wide-field projection lithography objective lens. Four groups of lens groups made of three high transmittance materials are adopted to achieve an objective lens with two times of a magnification and a wide field, the image quality is better, particularly wave aberration and astigmatism aberration can be corrected. In addition, by adopting the high transmittance materials which are easy to process and have a lower cost, the cost is reduced while the transmittance is greatly improved.