The utility model relates to a torsion beam support behind car, its characterized in that: including support bottom plate (41) and support body (42), weld together behind the stamping forming respectively support bottom plate (41) and support body (42). Support body (42) are U type structures, and the lateral wall open end of U type structure is the highest, become short to the centre transition gradually, the processing of going back the symmetry on the lateral wall of support body (42) U type structure has mounting hole II (421). The lateral wall upper end edge of support body (42) U type structure has flange structure (422). Be provided with a plurality of mounting holes on support bottom plate (41) I (411) in order to be connected with car longitudinal beams (6). The utility model discloses a components of a whole that can function independently punching press rewelding becomes integrative torsion beam support, makes its manufacturing process oversimplify, and it is more convenient to make the mounting point arrange simultaneously, does benefit to the universalization and the assembly of automobile body.