The utility model relates to a cascade stage non-partial discharge test transformer which comprises a transformer body and an insulating shell and is characterized in that the transformer body is provided with a square-shaped iron core, an upper pagoda-shaped winding and a lower pagoda-shaped winding are arranged on an upper core column and a lower core column of the square-shaped iron core, and the output end of the transformer body is connected with a protective resistor; and two sections of the insulating shells are butted and covered at the periphery of the transformer body, and are connected and fixed by a butted screw, and the insulating shell is formed by winding epoxy composite materials. By adopting the cascade stage non-partial discharge test transformer, the problem that the existing transformer for electric power tests is limited by height when in transportation is solved, the height requirement for transportation can be met, and the technical requirements on the insulating strength and the partial discharge capacity of the transformer for the electric power tests can be met.