High-resolution and automatic-focusing electron microscope eyepiece system

The invention relates to a high-resolution and automatic-focusing electron microscope eyepiece system. The high-resolution and automatic-focusing electron microscope eyepiece system is characterized in that a first lens (1), an object plane (2), a second lens (3), a third lens (4), a fourth lens (5), a diaphragm (6), a fifth lens (7), a sixth lens (8), a seventh lens (9), an eighth lens (10) and an optical filter (11) are arranged in sequence from a microscope objective to an image plane (12). The high-resolution and automatic-focusing electron microscope eyepiece system is matched with a currently common microscope objective, an image is formed by utilizing a photosensitive chip and is output to a display screen, automatic focusing can be achieved, and the defects of inconvenient observation, non-clear imaging, inconvenient operation and the like in the prior art are overcome.