The invention discloses a sectional carbon-ceramic composite material rotor for aluminum melt purification. The sectional carbon-ceramic composite material rotor for aluminum melt purification comprises a graphite section and a composite section, wherein the graphite section and the composite section form a threaded connection; the composite section comprises a C/C composite material upper section, a C/C composite material lower section and a C/C-SiC composite material section positioned between the C/C composite material upper section and the C/C composite material lower section; and the C/C composite material upper section, the C/C-SiC composite material section and the C/C composite material lower section form an integral structure. Besides, the invention also discloses a preparation method of the sectional carbon-ceramic composite material rotor. Compared with the existing graphite rotor, the C/C-SiC composite material is used instead of the original coating or ceramic bushing in the corrosion oxidation region, and the excellent oxidation resistance and corrosion resistance of the SiC material are utilized, thereby basically overcoming the inherent defects in the graphite rotor material.