The utility model discloses a two line track roof beams of rail formula track traffic are embraced in magnetic suspension, including erectting left case roof beam and the right case roof beam on the pier, left case roof beam is the same with the structure of right case roof beam, and left case roof beam is in through a left bearing installation on the pier, right case roof beam is in through a right bearing installation on the pier, the left branch seat is the same with the structure of right branch seat, the right side of left side case roof beam with be in the same place through a horizontal gird fixed connection in the left side of right side case roof beam, the horizontal gird is whole to be the cuboid shape and it is made by reinforced concrete, the horizontal gird set up in directly over the pier, and with there is the interval between the pier. The utility model discloses two left and right case roof beams pass through the connection of horizontal gird, and its the stiffness has obtained very big improvement, for during two monospars more than 3 times of rigidity about setting up alone, structural stiffness's promotion, corresponding deform when having reduced the structure atress greatly, have satisfied magnetism and have floated the strict demand of engineering to structure deformation.