The invention relates to the technical field of casting, in particular to a casting sandbox clamping device. A clamping frame is arranged between two fixing rods in a sleeving mode, wherein one fixing rod is fixedly connected to the side wall of an upper box body, and the other fixing rod is fixedly connected to the side wall of a lower box body. The clamping frame comprises a fist clamping hook, the first clamping hook is connected with a second clamping hook, a wedge block is arranged between the first clamping hook and the corresponding fixing rod; a U-shaped groove is formed in the side wall of the wedge block, an inserting hole is formed in the inner wall of the U-shaped groove, and a bolt is inserted in to the inserting hole; a connecting rod is arranged at the end of the first clamping hook and hinged to a push rod; and the end, away from the connecting rod, of the push rod is fixedly connected with a sleeve, and a hinge base is arranged perpendicularly on the side wall of the push rod. According to the casting sandbox clamping device provided by the invention, the practice that a threaded rod is used for reinforcing is avoided, when the box bodies are reinforced, the time required for loosening and fastening is short, meanwhile, sandboxes can be conveniently fastened and loosened without needing external tools, and using by a worker is convenient.