The present invention relates to a steel plate bridge abdominal plate reinforcement, the member forming the girder 10 is fixed to the side of the abdominal plate 11 in the width direction of the girder 10 provided at regular intervals along the longitudinal direction of the girder 10 And a plurality of vertical stiffeners 30 each having a through-hole 31 having one side open in the center of the longitudinal direction, and fixedly installed in a direction crossing the vertical stiffeners 30, and being provided in a continuous fashion as the plurality of vertical stiffeners. The structure consists of a plurality of horizontal stiffeners 40 fixedly installed through the through holes 31 of the stiffener 30, by reducing the concentration of fatigue stress due to the repeated load generated in the horizontal stiffeners, the abdominal plate of the girder It is possible to prevent destruction by sag and buckling.
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