The invention relates to the field of power transmission techniques, in particular to a 110kV power transmission line GIS equipment bus bar supporting device. The supporting device comprises a gate type supporting unit and an end supporting unit; the gate type supporting unit comprises a left base, a left diagonal draw steel bar, a left support, a left bus bar, a first upper beam, a right support, a second upper beam, a first lower beam, a second lower beam, a bus bar middle flange, a right base, a right diagonal draw steel bar and a right bus bar; the end supporting unit comprises a bus bar, a bus bar end flange, an I-steel support, an I-steel support end diagonal steel bar, an I-steel support side diagonal steel bar and an I-steel support base. The 110kV power transmission line GIS equipment bus bar supporting device greatly increases the stable operation degree of a power grid, plays a role in prompting economy development and society stabilization of the Qinghai area, and the invisible economic benefits of the supporting device are tremendous.