The invention discloses a forming device of a silver soldering sheet for soldering of a blade and a hard alloy sheet. The device comprises a base; the base is provided with a lower forming plate capable of moving horizontally and a limiting block capable of moving vertically; the limiting block, the lower forming plate and the base cooperate to form forming gaps; the upper end of the lower forming plate is provided with a first inclined forming surface, one end of the first inclined forming surface is provided with a first convex forming arc, and the other end of the first inclined forming surface is provided with a first concave forming arc; an upper forming plate is rotationally arranged above the base; the side end of the upper forming plate is provided with a second inclined forming surface matched with the first inclined forming surface; one end of the second inclined forming surface is provide with a second concave forming arc matched with the first convex forming arc; and the other end of the second inclined forming surface is provide with a second convex forming arc matched with the first concave forming arc. The forming device is simple in structure and easy to operate, forming of the silver soldering sheet is conducted through the forming device, the production efficiency is greatly improved, and the production cost is effectively reduced.