The utility model provides an equipartition welding is gone up to an otic placode, every half circular hoop has many metal circle strips of buckling, every buckle metal circle strip by first vertical to hypomere, horizontal segment and second vertical to the hypomere in order the head and the tail hookup form that electric power tower pot shape is fallen and is hindered lightning protection device, metal circular hoop comprises two and half circular hoop that the shape is the same, and every half circular hoop both ends has the bolt of confession to couple respectively. This device replaces current single piece -root grafting ground wire with netted earth connection form, has greatly reduced the ground resistance of earth connection, has strengthened the lightning -arrest effect of earth connection, and old pole tower had been installed to this device simple structure, specially adapted earth connection is to the take shelter from the thunder improvement of effect of ground.