The utility model discloses a safe distance measuring device of transformer substation, connect at design hose end's scale including installing, two sets of flexible scales articulate on setting firmly the articulated slab on the scale connects, and two sets of flexible scales correspond 6 sizes of 10kV, 35kV distribution device safe distance respectively, and wear -resisting sheath is installed to the flexible pipe of other end spiro union of qualitative hose, flexible pipe low side, and the scale connects and is equipped with the LED lamp, and the switch is established at flexible pipe low side. To sum up, the utility model discloses structure exquisiteness, convenient to use, reasonable, the powerful of cost make things convenient for the workman to use, improve work efficiency.