The utility model belongs to the technical field of hoist frames, and discloses a hoist frame for detaching a main transformer fan. The hoist frame is characterized by comprising a vertical supporting rod and a cross rod which is positioned at the top end of the supporting rod and connected with the supporting rod; and the lower end of the supporting rod is provided with a base plate. When the hoist frame is used, the base plate is placed in an oil pool or on the ground, the supporting rod is adjusted to a height in line with a main transformer radiator, the cross rod is fixed on an oil collection box of the radiator in an overlap joint manner, and a rubber plate or a wood plate is lined below the cross rod to protect the radiator from being broken; and a fan to be replaced is lifted by lifting equipment which is fixed on the cross rod, so that the hoist frame is convenient to use, and the work efficiency is greatly improved. After the hoist frame for detaching the main transformer fan is used, labor of 2 to 3 workers for detaching one fan can be saved, the working time for detaching the fan can be shortened by 50 percent, and the fan can be replaced without stopping a main transformer.