The utility model relates to the technical field of supports, in particular to a support for fixing a bridge frame, which comprises a fixing bottom plate, a connecting piece is vertically welded on the fixing bottom plate, a fixing piece is welded at the upper end of the connecting piece, and the fixing piece is connected on the bridge frame through a bolt. First fixing holes are formed in the positions, close to the two ends, of the fixing bottom plate, and second fixing holes are formed in the positions, close to the two ends, of the fixing piece. The connecting piece is made of angle steel and is fixedly welded in the middle of the fixed bottom plate; the bridge frame penetrates through the first fixing holes through bolts and is connected with the fixing pieces. The device is applied to vertical bridge laying in a shaftway with a narrow space, is flexible in form, is small and exquisite, saves the installation space, and can firmly fix the bottom plate and the side plate of the bridge at the same time; the form of the bridge support can greatly improve the stress of the bridge, saves the use amount of support steel, can be integrated with the bridge for installation, and shortens the construction period.