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As projectors are gradually becoming popular, the products are rapidly changing from original professional applications to personal or home applications; in order to meet the needs of miniaturization, high illumination, and low power consumption of short-focus mini-projection, a short-focus mini-projection optical system applicable to 0.3″ monolithic digital light processor is designed; in this paper, based on the homogenization characteristics of the compound eye lens, the lighting system design is completed by using the compound eye lens homogenization shaping light source, combined with the lighting technology scheme of prism steering, and the illumination distribution of the lighting system is analyzed; secondly, based on the imaging principle of the anti-telephoto structure, combined with aspheric and telecentric in image space technology, the imaging system increases the depth of field on the basis of shortening the optical path; finally, the simulation model of the imaging system is established, and the image quality and tolerance of the imaging system are analyzed; the results show that the illumination system has an illumination uniformity of 90.91% on the digital micromirror device and the optical efficiency of the whole system reaches 88.45%; the length of the imaging system is 53.9 mm, the full field of view reaches 67°, the modulation transfer function at 93 lp/mm is greater than 0.52 and the distortion is less than 1.0%; the system has the advantages of compact structure, small size, high illumination, and meets the requirements.