The utility model relates to a phase -shifting transformer communicates box has inside support including the box body that is used for connecting two side fuel tank, box body inside wall welding, the lateral wall of box body be provided with strengthen iron and under the box body lateral wall be provided with the supporting seat of being connected with two side fuel tank, supporting seat and box body between be connected with the lead screw that can make the box body reciprocate. The utility model discloses the structure is succinct, and the low price not only makes the convenient easy operation of installation, has reduced the probability of emergence accident, has ensured staff's safety, portable transportation moreover, greatly increased work efficiency.