The invention discloses a quick clamping device for processing automobile straight connecting rod splitters through line cutting. The quick clamping device comprises a large bottom plate horizontally arranged, a small bottom plate which is connected to the top surface of the large bottom plate and can be adjusted in position horizontally, and a pair of big end hole positioning pins in butted contact with the inner hole wall surface of a straight connecting rod big end hole are arranged at the edge, close to the straight connecting rod big end hole, of the large bottom plate. Compared with the prior art, the technical scheme adopted by the quick clamping device provided by the invention has the advantages that the position of the straight connecting rod big end hole can be fixed in advance by adjusting the positions of the sliding blocks of the positioning pins, so that quick and accurate positioning is achieved, and the consistency of the depths and the perpendicularities of splitters on the two sides of the inner wall surface of the inner hole of the connecting rod big end hole are guaranteed to be kept. Pushing blocks with centering and positioning functions and two big end hole positioning pins are used for limiting and positioning the straight connecting rod from three positions, and the positioning accuracy and the machining process stability are ensured, therefore, the quality of the splitters is enabled to be relatively high. In addition, the pushing block and the sliding blocks of the positioning pins can be adjusted and moved, so that the technical scheme provided by the invention is applicable to clamping of straight connecting rods in different types, and is of relatively high university.