Cutter bar strengthening structure

The invention provides a cutter bar strengthening structure, which overcomes the defect that the existing cutting tool is easy to rust to cause breakage by virtue of an external welding means of a V-shaped structure, adopts an internal welding mode. The cutter bar strengthening structure comprises a cutter bar, a blocking piece, a rigid body, a gap, a through hole and a metal welding part. The cutter bar is provided with a groove, the blocking piece is combined with the opening of the groove; the rigid body is sealed in the groove of the cutter bar by the blocking piece; the gap exists among the rigid body, the cutter bar and the blocking piece; the through hole connects the gap to the outer surface of the cutter bar; and the metal welding part fills the through hole and the gap, so that the rigid body is combined with the cutter bar into a whole. Therefore, the metal welding part belongs to an internal welding structure, so that the strength of the cutter bar is improved, and meanwhile, the defect that an ex