Abstract: An insulating lift is presented to improve the insulation property between the gripper and ground of high voltage hot-line cleaning robot,and to decrease the initial cylinder’s working-pressure of vertical lifting mechanism.The presented insulating lift adopts the traditional scissor structure,and is actuated by the master-slave voussoir and horizontal slide block with relay style.In the paper,the high-voltage insulation property of the lift is designed and analyzed firstly,and then according to the dynamic model of the lift,the optimum design is implemented.At the end,the high voltage withstand test is made,and the working-pressure of the lift is measured.The results of test and measurement show that the insulating lift is of great insulating ability,low starting pressure,and good stability during actuation switching,satisfying the actual application demands of hot-line cleaning robot.