The utility model provides a tower grounding device under limited construction area of distribution network, belongs to distribution lines shaft tower lightning grounding field. Including grounding body (1), its characterized in that: grounding body (1) is arranged in ground connection hole (2), grounding body (1) including spirochaeta (4) and connect (3), connect (3) and fix at the top of spirochaeta (4), connect (3) in grounding body (1) at least and draw from the port department in ground connection hole (2), still be provided with a plurality of support piece (5) in the outer border of spirochaeta (4) along spirochaeta (4) axial, spirochaeta (4) are flexible conducting material. In this tower grounding device under limited construction area of distribution network, it is downthehole toarrange spiral helicine grounding body in set up perpendicularly on ground ground connection, has reduced ground resistance, and distribution lines's resistant thunder level need occupy a large amount of specific surface area's drawback when having avoided simultaneously among the prior art extending the mode ground resistance of grounding body through the level.