The invention relates to a portable external insulation creepage distance measuring tool. The portable external insulation creepage distance measuring tool is technically characterized by comprising ahandle, a silica gel ruler, a turntable, a rolling shaft and a knob, wherein scales are printed on the surface of one side of the silica gel ruler, and creepage distances corresponding to voltage grades under different pollution grades are marked on the surface of one side of the silica gel ruler; the surface of the other side of the silica gel ruler has viscosity; one end of the silica gel ruleris fixed on the surface of the turntable and is integrally wound on the turntable; the rolling shaft is sleeved with the rotating disc; the rolling shaft is positioned in the middle of the handle, and two ends of the rolling shaft are arranged on the handle; and the knob is arranged at the end part of the rolling shaft and is used for rotating the rolling shaft. The portable external insulation creepage distance measuring tool is reasonable in design, solves the problems of inaccurate measurement precision, inconvenience in operation and the like in a traditional method for measuring the creepage distance by using tools such as adhesive tapes or metal wires or ropes, has the advantages of low manufacturing cost, small size, convenience in carrying, simplicity in operation and the like, not only improves the measurement precision, but also improves the working efficiency, and provides convenience for daily inspection, hidden danger troubleshooting and fault analysis work of operators.