A machine vice quick locking system being a machine vice unit with modified mounting blocks, each having a plurality of vertically inclined continuous hole spaces with the mid-space portion of each hole space being amenable to receipt of the nut portions of a plate-bolt-nut complex unit serving to quickly facilitate a locking fast of either one and ultimately both of a pair of equivalently sized jawplates to either of the anterior or posterior walls of either modified mounting block portion of the machine vice unit with each jawplate featuring a pair of horizontally inclined counterbored holes for receipt by each, of one bolt portion of each complex unit.