In an oil immersed transformer with a maintenance platform, an oil outlet is arranged above the other side of a box body, an oil inlet is connected with an oil input pump, the oil outlet is connected with an external oil storage device, an oil change partition plate is arranged below an iron core, the maintenance platform is arranged outside the box body and comprises a maintenance plate and a support rod, the maintenance plate is rectangular-shaped, one end of the maintenance plate is movably arranged outside the box body, a plurality of clamping holes are formed in a lower surface of the maintenance plate, a fixing hole is formed in the exterior of the box body, and two ends of the support rod are respectively arranged in the fixing hole and the clamping holes. By additionally arranging the oil change partition plate in the box body, oil change can be rapidly and completely performed, oil in the box body is stored in the oil storage device, iron core maintenance and oil change operation are facilitated, the cost is reduced, and the maintenance efficiency is also improved; and moreover, the maintenance platform is arranged in the oil immersed transformer, a debugging operator is convenient to place a tool during debugging, the debugging efficiency is greatly improved, and the safety coefficient is improved.