The invention discloses a graphite composite multistage depressed collector and a manufacturing method thereof, relating to a vacuum electronic technology, in particular to a novel multistage depressed collector capable of being used for a satellite travelling wave tube and a manufacturing process thereof. The multistage depressed collector provided by the invention is prepared from common karbate impervious graphite substrate and pyrolytic graphite which are metalized and brazed to be assembled into a multistage depressed collector assembly. By sufficiently utilizing the advantages of the common karbate impervious and the pyrolytic graphite and adopting a graphite electrode material with a low secondary electron yield, the recycling efficiency of the multistage depressed collector is increased, and the total efficiency of the travelling wave tube is increased further. The defect of easily generating dust, caused by low strength of common graphite and small binding force of particles, is avoided with the method adopted by the invention.