Combined dry-type transformer

The utility model discloses a combined dry-type transformer which comprises a protection box, mounting holes are formed in the left end face and the right end face of the protection box in a penetrating mode, two first partition plates distributed left and right are fixedly connected into the protection box, and two second partition plates distributed up and down are fixedly connected between the two first partition plates and the inner wall of the protection box. A filter mechanism is arranged between the first partition plate and the mounting hole and comprises a ventilation pipeline, a mounting frame is fixedly connected to the interior of the ventilation pipeline, filter cloth is fixedly connected to the interior of the mounting frame, and a protective cover is arranged on the face, away from the first partition plate, of the ventilation pipeline; dust in the air is intercepted by the filter cloth, when the dust on the filter cloth is more, the ventilation pipeline slides backwards, the air inlet is align