The invention provides an art knife and belongs to the technical field of manual cutting tools. The art knife is characterized by comprising a knife body, a gear shifting module and a knife rest; a movable groove and multiple locating grooves are formed in the knife body; the gear shifting module is arranged in the knife body in a sliding manner and located in the movable groove or one locating groove; the knife rest is arranged in the knife body in a sliding manner and provided with a blade and the knife rest and the gear shifting module are connected through a tension spring; the gear shifting module is limited in the movable groove, the knife rest moves along the knife body to drive the blade to extend out of the knife body, the tension spring drives the knife rest to automatically retract into the knife body, the gear shifting module is limited in the corresponding locating groove, the knife rest is fixedly connected to the gear shifting module, and the gear shifting module drives the blade to extend out of the knife body. The art knife has the beneficial effects that use is convenient and the blade is convenient to replace.