The invention discloses a tantalum capacitor square tantalum core specific molding die and a use method of the same, and a technical problem that a square tantalum core cannot be molded because a tantalum core molded by an existing molding die is in an elongated cylindrical structure. The tantalum capacitor square tantalum core specific molding die comprises an upper convex die, a concave die, a lower convex die, an adjusting cushion block, a tantalum filament spacing block and adjusting gaskets, wherein the adjusting cushion block is matched with the lower convex die; the concave die is matched with the lower convex die; the concave die and the lower convex die form a semi-sealed molding cavity; tantalum power is poured into the semi-sealed molding cavity and then tantalum filaments are arranged on the tantalum powder; a tantalum filament spacing block spaces the tantalum filaments; the tantalum powder is poured after the tantalum filaments are spaced; the upper convex die is matched with the concave die; a sealed square molding cavity is formed by the upper convex die, the concave die and the lower convex die, so a square tantalum core can be pressed; and the adjusting gasket with proper size can be selected for laminated pressing according the size of the tantalum core.