The invention discloses a connecting piece used for a bridge body. The connecting piece used for the bridge body comprises two horizontal buckling plates and two longitudinal buckling plates, whereinfirst rectangular notches are formed in the long edges of each horizontal buckling plate, and fixing notches used for clamping and fixing steel bars are formed in the short edges of each horizontal buckling plate; second rectangular notches are formed in the long edges of each longitudinal buckling plates, and fixing notches used for clamping and fixing steel bars are formed in the short edges ofeach longitudinal buckling plate; the horizontal buckling plates and the longitudinal buckling plates are defined to be in an S shape in the whole; the second rectangular notches are completely matched with the first rectangular notches after being buckled; and the connecting piece is defined by the two horizontal buckling plates and the two longitudinal buckling plates, and buckled parts are finally reinforced and connected through welding. By the adoption of the connecting piece used for the bridge body, the technical problems that the rigidity of part of connecting pieces used for an existing steel web-concrete combined box girder structure is too large, and consequentially, the manufacturing cost of the connecting pieces is high, and welding is difficult are solved.