Shear blade tensioning device for double-side shears

The utility model provides a shear blade tensioning device of a pair of double-side shears. The device comprises a first hydraulic cylinder and a second hydraulic cylinder, the first hydraulic cylinder and the second hydraulic cylinder are the same in specification and are arranged in parallel, the output end of the first hydraulic cylinder is connected with a first tension bolt, and the output end of the second hydraulic cylinder is connected with a second tension bolt. The output end of the first tension bolt and the output end of the second tension bolt serve as mounting shafts of an upper blade table of a shear blade of the double-side shear, the upper blade table of the shear blade of the double-side shear is fixed through a hexagon nut after being mounted, a connecting frame is arranged between the first tension bolt and the second tension bolt, and the tail end of the first hydraulic cylinder and the tail end of the second hydraulic cylinder are hinged to a support. And the support is fixedly mounted o