The utility model relates to a cutter mechanism and printer of printer, the cutter mechanism of printer, include: and a frame, the frame includes baffle and bearing board, the baffle set firmly in on the bearing board, and with the bearing board formation exit slot that cooperatees, the bearing board be equipped with with the strip connected in star that the exit slot interval set up, cutting assembly, cutting assembly includes the cutter and is used for the drive the cutter is followed the both ends reciprocating motion's of exit slot drive arrangement, the cutter is equipped with the cutting edge, the cutting edge set up in in the strip connected in star, be used for detecting whether the exit slot has the detection device that paper came out, and controller, the controller with detection device reaches drive arrangement communication connection. This cutter mechanism and printer of printer can be used for the no base stock of cutting, and can avoid the STICKER phenomenon, prevents to print good label and appears damagedly.