The present invention relates to a sheet material cutter and image forming device, an upper edge portion (38) is in facing direction with top surface (200A) of an adhesion sheet material (200), an lower edge portion (39) is in facing direction with bottom surface (200B) of the adhesion sheet material (200), the front end (38A) of the edge portion is arranged in facing direction with the front end(39A) of the edge portion, when being cut, the upper edge portion (38) and the lower edge portion (39) are acting up and down, the front end (38A) of the edge portion and the front end (39A) of the edge portion apply equal force from the two sides of the adhesion sheet material (200) to cut, compared with existing one edge cutting image sheet material namely adhesion sheet material (200) three-layer occasion, each layer displacement is small, the stress generated on the interlayer color temper is small, thus inhibiting image from chapping or sheet material from stripping, obtaining photography picture quality image with better terminal rim. The present invention provides a sheet material cutter and an image forming device, which can form a sheet material with orderly terminal rim, brightness and high quality photography tactile sensation easily and reliably.