The invention discloses a distortionless high-resolution large-viewing angle unmanned aerial vehicle lens optical system, which comprises a lens front group and a lens rear group arranged sequentially along a light incidence direction. A diaphragm is arranged between the lens front group and the lens rear group; the lens front group comprises a first lens, a second lens, a third lens and a fourth lens arranged sequentially along the light incidence direction, and the first lens, the second lens, the third lens and the fourth lens are respectively a meniscus negative lens, a meniscus negative lens, a meniscus negative lens, and a biconvex positive lens; and the lens rear group comprises a fifth lens, a sixth lens and a seventh lens arranged sequentially along the light incidence direction, and the fifth lens, the sixth lens and the seventh lens are respectively a biconvex positive lens, a meniscus negative lens and a biconvex positive lens. The distortionless high-resolution large-viewing angle unmanned aerial vehicle lens optical system has the advantages that the visual angle is 100 DEG, the distortion is less than 3%, and the resolution can reach 12 million-pixel.