The invention relates to a transformer station accident oil drainage pool water discharge system, which comprises an oil storage pool, wherein a sunk shaft is arranged at the bottom of the oil storage pool; a floater starting device is arranged in the sunk shaft; and a pipeline arranged at the bottom of the oil storage pool is led to a position of an oil pump on the ground. After the transformer station accident oil drainage pool water discharge system is applied to production operation activities, complicated work processes of regular inspection on oil pits and oil pit water discharge by operation maintenance personnel can be omitted; particularly in rainy season, the precipitation is great, the humidity is high, and the water discharge operations are frequent; the water discharge system can automatically maintain the dryness in the pits all the year, and ensures no misoperation when main equipment fails.