The invention discloses a carbon fiber reinforced PEEK gear and a preparation method thereof, relating to the technical field of manufacturing of mechanical parts. The carbon fiber reinforced PEEK gear is prepared from the following raw materials in percentage by weight: 30 to 60% of carbon fiber, 40 to 70% of PEEK resin and additives thereof; compared with an ordinary plastic reinforced composite gear, the carbon fiber reinforced PEEK gear has more excellent strength, wear resistance, heat resistance and self-lubricating performance, the preparation process is simple, and large-scale production can be realized.