Truss for assembly type bridge

The utility model relates to the technical field of trusses for bridges, and discloses a truss for an assembly type bridge, which solves the problems in the background technology, and comprises a first truss and a second truss, the tops and the bottoms of the first truss and the second truss are respectively and fixedly connected with a second fixing plate and a first fixing plate, the second fixing plate is attached to the first fixing plate, a sliding groove is formed in an inner cavity of the first truss, a first spring is fixedly connected to the bottom of an inner cavity of the sliding groove, a sliding plate is fixedly connected to the top of the first spring, a clamping rod is fixedly connected to the top of the sliding plate, a clamping groove is formed in the bottom of the first fixing plate, and the clamping rod can be inserted into the clamping groove. A threaded groove and a limiting groove are formed in the top and the bottom of the side face of each clamping rod respectively, a sliding groove is