The invention discloses a fixing structure for a supporting strip of a C-shaped tube bundle heat exchanger. The fixing structure comprises a supporting piece, a connecting assembly and a supporting strip. One side of the connecting assembly is fixed on the supporting piece while a connecting plate is arranged on the other side of the connecting assembly. The end portion of the supporting strip is arranged through the connecting assembly and is fixedly connected to the connecting plate through a fastener. According to the fixing structure disclosed by the invention, the supporting strip is fixed by means of bolt (stud) connection through the connecting plate, so that the supporting strip and the supporting piece are prevented from being directly welded, the problems that the stress of the weld joint of the supporting strip is excessive and the supporting strip is welded in a deformed manner and the like are solved, and meanwhile, equipment is favorably manufactured and mounted.