Oil changing device for gear box of fan

The utility model discloses a fan gear box oil changing device which comprises a movable box body, a reversing mechanism, a filtering mechanism and an oil storage mechanism, the reversing mechanism, the filtering mechanism and the oil storage mechanism are arranged in the movable box body, the reversing mechanism is provided with an oil inlet and an oil outlet which are not opened or closed at the same time, the filtering mechanism comprises a filtering groove and a settling pond, the filtering groove is located below the oil outlet, and the settling pond is located below the filtering groove. The sedimentation tank and the oil storage mechanism are connected and internally communicated, and the oil storage mechanism is communicated with the oil inlet. The sedimentation tank and the oil storage mechanism can be pushed into the movable box body or pushed out of the movable box body, impurities can be conveniently cleaned, waste oil can be filtered in the filter tank and the filter tank and then settled through