The utility model relates to a stride umbellate form labyrinth cross arm insulator insulating boot, including striding umbrella section insulating boot, cross arm end insulating boot and lead wire portion insulating boot, stride the cladding of umbrella section insulating boot in cross arm insulator full skirt portion, the cladding of cross arm end insulating boot is served at cross arm insulator's cross arm, and the insulating boot cladding of lead wire portion is on the position of lead wire and cross arm end lap down. The cross arm insulating boot wholly is side along an axial open -ended cover tubular construction, and the holistic side of cross arm insulating boot is equipped with along axial open -ended one end that the insulating boot is whole bordures first, and the holistic side of cross arm insulating boot is equipped with along the axial open -ended other end that the insulating boot is whole bordures second, and the insulating boot is whole bordures and second cover along whole first the marginal folding bag of borduring of insulating boot form " returning " the labyrinth structure of borduring that appears on whole first the surface of borduring of insulating boot. The utility model discloses an all standing and " returning " shape labyrinth structure of borduring has improved the insulating properties of cross arm insulator on high -pressure overhead line, has the characteristics of cross arm all insulation cover.