The invention discloses a gear with replaceable gear teeth. The gear with the replaceable gear teeth comprises a gear body, the gear teeth, a positioning plate and fastening screws; the center position of the gear body is provided with an installing hole; the positioning plate is arranged in the gear body and is of a round structure; conical grooves are formed in the periphery of the positioning plate with the installing hole as the center; the tail ends of the gear teeth are provided with protrusions matched with the conical grooves; and the gear teeth are fixedly connected with the gear body through the fastening screws. The gear with the replaceable gear teeth has the beneficial effects of being simple in structure, high in efficiency, long in service life, flexible and convenient to use, convenient to maintain and the like, the gear teeth can be replaced independently, maintenance is convenient, the maintaining time is greatly shortened, the production efficiency is improved, the conical grooves in the positioning plate are completely matched with the protrusions of the gear teeth, fixed installation is achieved through the fastening screws, and it can be guaranteed that the gear cannot move or shake in the rotating process.