The invention discloses a full carbon fiber composite material reflection lens for an optical system and a manufacturing method. A carbon fiber composite material is used for manufacturing each component of the reflection lens, and the full carbon fiber composite material reflection lens is obtained by adhesively-bonded cocuring. The anti-deformation performance is strong, the thermal stability is good, and the temperature matching problem of the reflection lens and camera other composite material structures is solved. According to the manufacturing technology, the high precision full carbon fiber composite material reflection lens can be manufactured in a short time, and compared with a conventional reflection lens manufacturing process, the technology has the advantages of short manufacturing cycle and low manufacturing cost.