The invention relates to the technical field of GIL installation, in particular to a GIL installation tool, a control system, and a control method. The GIL installation can be realized, the manpower is saved, and the installation efficiency can be improved. The GIL installation tool comprises a walking mechanism, wherein the walking mechanism comprises a rack capable of moving along a first direction; an adjusting support is loaded above the rack; a support seat stretching out along a second direction is arranged on the adjusting support; a first drive mechanism is arranged between the adjusting support and the rack, and is used for driving the adjusting support to stretch out along the second direction; the first direction is perpendicular to the second direction; a second drive mechanismis arranged between the support seat and the adjusting support, and is used for driving the support seat to move in a perpendicular direction; the support seat comprises a support frame and a supportgroove movably connected with the support frame; the support frame can drive the support groove to move along a horizontal axial direction and a horizontal radial direction of a GIL pipe unit to be adjusted under the drive of the third drive mechanism; and the support groove can rotate along an axial direction under the drive of a fourth drive mechanism.