The utility model relates to an eliminating device for a bridge horizontal force and aims to efficiently eliminate the horizontal force between a bridge and a pier and increase the convenience of construction. The eliminating device comprises a pair of upper anchoring plate (10) and lower anchoring plate (20) which are mutually parallel and are longitudinally separated; the upper anchoring plate (10) and lower anchoring plate (20) are provided with corresponding sliding slot and block tenon; and the sliding slot and the block tenon are extended along the bridge direction. The eliminating device for a bridge horizontal force has the advantages that the horizontal force between the bridge and the pier can be efficiently eliminated; the device is industrially produced, so the precision and the clearance can be conveniently ensured; and the field mounting construction is convenient.