Bridge and construction method of bridge

The invention discloses a bridge and a bridge construction method. The bridge comprises a track beam; the bridge pier assembly is arranged below the track beam, the bridge pier assembly comprises a bridge foundation and a bridge pier, the bridge foundation is arranged below the bridge pier, the bridge foundation comprises a first concrete part, a plurality of first main reinforcements, a plurality of second main reinforcements and a first sleeving piece, the first main reinforcements are arranged at intervals in the length direction, and the second main reinforcements are arranged at intervals in the width direction; the plurality of first sleeving pieces are arranged at intervals in the width direction; and the first sleeving piece is connected to the outer side of the second main reinforcement in a sleeving mode, the second main reinforcement can move relative to the first sleeving piece, and the first concrete part wraps part of the first main reinforcement and the first sleeving piece. The movable space is reserved through the first sleeving piece, so that in the connection construction of the track beam and the pier, more movable space is provided for the second main reinforcement through the first sleeving piece, other additional operations such as engineering rework or reinforcement planting caused by mutual conflict of the reinforcements can be avoided, and the construction period is prevented from being delayed.