A device (40) and a method for manufacturing composite parts such as aircraft bulkheads (23), in which a component of the composite part is placed on a first mold (11) with a robotic device (21), a component of another composite part is placed on a second mold (12) with a robotic device (22), the second mold (12) having a surface identical to the surface the first mold (11), and the first mold and the second mold being mounted on a frame in a central symmetric arrangement around a symmetry central point (15), such that components are placed on the molds (11, 12) symmetrically so as to obtain two identical composite parts at the same time.