The utility model belongs to the technical field of electric power box, and discloses a transformer station power box characterized by comprising a box body and a box door, wherein a side surface of the box body is provided with a cable inserting hole. When the transformer station power box is not in use, the box door can be closed, when the transformer station power box is in use, the box door is opened, a cable is inserted into the transformer station power box through the cable inserting hole, an operator connects the cable to a power supply at a position of the box door, then closes the box door, therefore, safe accidents caused by opening of the box door can be prevented, and no one needs to be on duty.