A high-resolution video telephoto objective lens is a small-view-field high-resolution imaging system which is formed by sequentially placing four coaxial lens sets, and the four coaxial lens sets are separated far. From left to right, the first lens set is a thick meniscus doublet lens set, the second lens set is a double-splitting lens set which is formed by two lenses, the distance between the two lenses is small, the third lens set is a doublet lens set, and the fourth lens set is a single positive thin lens. A aperture diaphragm is arranged between the second lens set and the third lens set, according to the high-resolution video telephoto objective lens, the working distance is W.D.= 8, the focal distance f'=320mm, the relative aperture D/f'=1/5.7, the object space view field angle omega=0.698 degrees, and the image space resolution sigma=1.6 micrometers. The high-resolution video telephoto objective lens is used in cooperation with a high-resolution CMOS camera with the fourteen million pixels, the target surface of the camera is 1/2.3', and the surface state of a monitored target beyond 300m can be displayed through a computer screen video.