Exploring the universe has been a dream of mankind since ancient times, and observation with a telescope is among the most economical way. However, using current large telescopes is far away from being “economical”, and their observation capabilities are limited. In this regard, this article puts forward a new principle of telescope, designs a sophisticated light combing system-Light-filtering Ring, and conceives a new type of telescope-Light-filtering 10 Telescope. Compared with current telescopes, Light-filtering Telescope has amazing observation ability and smaller size, which makes it naturally suitable for detecting dim cosmic targets in deep space. Once successfully used, it will greatly expand the horizons of astronomical observation and save tens of billions of dollars in the field.