The utility model provides a high-voltage testing device trolley, which comprises a vehicle-mounted platform, wherein the two sides of the vehicle-mounted platform comprise a first guardrail and a second guardrail, the heights of the first guardrail and the second guardrail are different, the first guardrail and the second guardrail are mutually parallel, the height of the first guardrail is greater than that of the second guardrail, and in addition, the first guardrail is positioned at the inner side of the second guardrail. When the high-voltage testing device trolley provided by the utility model is adopted, a high-voltage testing platform, a switch machine cabinet, a large-scale transformer and the like can be conveniently and firmly fixed on the high-voltage testing device trolley through the double-layer guardrails, and the mounting and the dismounting are very convenient. When the high-voltage testing device trolley provided by the utility model is used for transporting heavy high-voltage equipment, the transportation process is safe and stable, the conditions of collision, falling and the like cannot easily occur, and the transportation reliability of the equipment is ensured.