The utility model relates to the field of bridge floors, in particular to a fastener structure for a steel beam bridge open-bridge-floor track. The fastener structure is characterized in that a stopping shoulder is arranged on an iron chair, a track gauge adjusting block is arranged on the inner side of the stopping shoulder, one side of the track gauge adjusting block is in snap joint fit with the track, the other side of the track gauge adjusting block is in limiting fit with the stopping shoulder, and the track gauge adjusting block is buckled and pressed with an elastic strip. The fastener structure has the advantages of being simple in structure, convenient to install, low in manufacturing cost and convenient to popularize, the track gauge can be adjusted at random through the track gauge adjusting block, and the geometric shape of the track can be effectively guaranteed. Base plates are classified, resistance values of a fastener can be adjusted in a pertinent mode, and therefore mutual effects between beams and tracks are effectively reduced. Components are stable in performance and can be perpetually used. The fastener structure can be widely applied to open-bridge-floor paving in the track transit field, and the safety and the stability of a track structure system are guaranteed.