The invention discloses a washing mechanism applicable to a transformer radiator. The mechanism comprises a handheld rod, a fixing device I, a fixing device II and a water spraying device, wherein thehandheld rod is a hollow rod in which a water hose is arranged; the fixing device I is mounted at the bottom part of the handheld rod and is sued for fixing the water inlet end of the water hose, andmoreover, the water inlet end of the water hose is connected to a high-pressure water pipe; the fixing device II is mounted on the top part of the handheld rod; the outlet end of the water hose is sleeved with the fixing device II; the water spraying device is detachably mounted in the fixing device II; and different water spraying devices can be replaced based on the transverse and vertical directions of radiating sheets of a transformer, so that the radiator can be quickly washed. According to the mechanism, the radiator at different height can be washed through a telescoping rod; the waterspraying device can enters two radiating sheets to flush, and different water spraying devices can be replaced to realize different water spraying directions, thus the horizontal surface to be washedcan be completely covered, and as a result, the radiator can be quickly washed; and the work is simple, convenient, quick, time saving and manpower saving.