Support adjusting device for bridge substructure construction

The utility model discloses a bridge substructure construction support adjusting device which comprises an adjusting seat body and a supporting seat, the supporting seat is arranged at the top of the adjusting seat body, a plurality of protection plates are arranged on the surface of the adjusting seat body, a plurality of through grooves are formed in the surfaces of the protection plates in a penetrating mode, and the through grooves are communicated with the supporting seat. A rotating rod is movably arranged in the penetrating groove, the outer end of the rotating rod extends out of the penetrating groove and is fixedly provided with a fixing piece, a clamping block is arranged on the inner side of the fixing piece, and a clamping groove allowing the clamping block to be embedded in is formed in the surface of the protection plate. Through the designed protection plate, the outer side of the adjusting seat body can be covered, the good protection effect on the adjusting seat body is achieved, the adjustin