The utility model provides a power transformer's jack bearing structure, it is including at least a set of sub - bearing structure, and the sub - bearing structure of every group includes atress board, two lower section risers and two atress board lower part reinforcing plates, atress board level sets up and is perpendicular with lower section tank wall, its inboard and lower section tank wall fixed connection, every lower section riser, the all vertical settings and perpendicular with lower section tank wall of every atress board lower part reinforcing plate, and the top of every lower section riser is connected with the lower fixed surface on lower section case edge, the last fixed surface of bottom and atress board is connected, inboard and lower section tank wall fixed connection, the top of every atress board lower part reinforcing plate is connected with the lower fixed surface of atress board, inboard and lower section tank wall fixed connection, the lower surface and the jack of atress board contact for play top power transformer. The utility model discloses weight requirement, the structure that can enough satisfy high -capacity power transformer are simple again.