The utility model discloses a safe edging cutter, including blade, blade holder and handle, the blade is fixed on the blade holder, and the length on each limit of blade holder all is greater than the length that the blade corresponds each limit, and the one end of blade is equipped with the V -arrangement open -ended cutting edge of indent, the V type cutting opening corresponding with V -arrangement open -ended cutting edge is seted up to the one end of blade holder, and V type cutting opening's width is less than the width of V -arrangement open -ended cutting edge, and V type cutting opening's the degree of depth is greater than the degree of depth of V -arrangement open -ended cutting edge, the blade holder of V type cutting opening's both sides part respectively has 90 to buckle, and the orientation of buckling is towards blade one side, and the width at the position of buckling is greater than the thickness of blade, corresponding on blade holder and the blade and having seted up a plurality of first mounting holes, and correspond on blade holder and the handle and seted up a plurality of second mounting holes, the blade is fixed on the blade holder through a plurality of first mounting holes adjustablely, the blade holder passes through the second mounting hole to be fixed on the handle. This safe edging cutter safe and reliable just can adapt to the technology condition of multiple difference.