The invention provides a fruit / vegetable slicer of simple structure, convenience for operation, uniformity in slice thickness and capability of replacing cutters of various thickness specifications quickly and conveniently. The fruit / vegetable slicer comprises a machine frame, three or several pairs of sliding rails, three or several sets of stepped-arranged cutters, three or several pairs of cutter carrier seats, three or several cutter setting slots and cutter setting slot seats, a manual lever and three or several sets of stroke controllers, wherein each set of stepped-arranged cutters includes two cutter carriers and several blades, symmetrical blade mounting holes are formed in each of the cutter carriers, and are arranged equidistantly in a stepped manner, two ends of each blade are respectively fixed into corresponding blade mounting holes in the two cutter carriers, the interval between the blades is the slice thickness of sliced fruit / vegetable, and the cutter carriers are of the same height, and are of the same distance from the upper / lower slot of each cutter carrier slot. The fruit / vegetable slicer provided by the invention not only is time-saving and labor-saving, but also can meet the requirement of modern families and restaurants for changing the fruit / vegetable slicing thickness at any time without destroying the tissue structures of the fruit / vegetable.