The present invention provides a laminator with a corner cutter including a main body, a laminating device and a cutting device. The main body includes a receiving space. The main body is horizontally formed with an entering slot, an exiting slot, a penetrating groove and a corner-cutting recess. The main body having two lateral sides formed between the entering slot and the exiting slot, the corner-cutting recess being disposed at one of the lateral sides. The laminating device disposed in the receiving space includes two rolling rods, a driving portion and two heaters. The two rolling rods are heated by the two heating members. The driving portion drives the two rolling rods to rotate. The cutting device includes a pushing portion and a cutting portion. The cutting device is disposed at one side of the receiving space where corresponding to the corner-cutting recess.