The invention provides an art knife which comprises a housing and is characterized in that two groups of knife rests are arranged in parallel, the two groups of knife rests are arranged in the cavity in the front part of the housing through a knife rest gasket in a sliding manner respectively, different kinds of blades are arranged on each group of knife rest, a push button, which has a pop-up upward trend, is arranged at the upper end of the knife rest, a strip groove, which is corresponding to the upper edge of the knife rest gasket, is formed in the upper edge of the housing, two parallel push grooves, on which the two push buttons can slide, are formed between the strip groove and the upper edge of the knife rest gasket, and a clamp foot, which is matched with a tap position groove to conduct positioning, is arranged at the side part of the push button, so as to realize the stretch of the blades and the positioning of the tap position. The art knife has a beautiful appearance, is safe to use and convenient to operate, has the functions of an assistant blade and double blades, and can afford different kinds of blades as required, and realize quick blade exchange and tap position positioning.