A method for constructing and revamping a blast furnace body, comprising: assembling a new furnace body of a blast furnace to construct the blast furnace body by taking in and stacking ring blocks (4A, 4B, 4C, 4D) for the new furnace body in order from the upper ring block, the ring blocks (4A, 4B, 4C, 4D) being formed by dividing the blast furnace body into plural numbers vertically; or revamping the blast furnace body by cutting an old furnace body of an existing blast furnace into plural numbers vertically, taking out and dismantling the cut plural ring blocks (4A, 4B, 4C, 4D) in order from the lower ring block, and then, taking in and stacking ring blocks (4A, 4B, 4C, 4D) for the new furnace body in order from the upper ring block, the ring blocks (4A, 4B, 4C, 4D) being formed by dividing the blast furnace body into plural numbers vertically, to assemble the blast furnace body, characterized in that: respective connection parts or cut parts of upper (4A, 4B, 4C) and lower ring blocks (4B, 4C, 4D) are temporarily connected by means of a connection tool in advance before the ring blocks (4A, 4B, 4C, 4D) are welded and connected or cut, and thereby, the lower ring block (4B, 4C, 4D) is lifted and held on the upper ring block (4A, 4B, 4C) in at least one step of the step of assembling the new furnace body and the step of from dismantling of the old furnace body to assembling of the new furnace body. assembling a new furnace body of a blast furnace to construct the blast furnace body by taking in and stacking ring blocks (4A, 4B, 4C, 4D) for the new furnace body in order from the upper ring block, the ring blocks (4A, 4B, 4C, 4D) being formed by dividing the blast furnace body into plural numbers vertically; or revamping the blast furnace body by cutting an old furnace body of an existing blast furnace into plural numbers vertically, taking out and dismantling the cut plural ring blocks (4A, 4B, 4C, 4D) in order from the lower ring block, and then, taking in and stacking ring blocks (4A, 4B, 4C, 4D) for the new furnace body in order from the upper ring block, the ring blocks (4A, 4B, 4C, 4D) being formed by dividing the blast furnace body into plural numbers vertically, to assemble the blast furnace body, characterized in that: respective connection parts or cut parts of upper (4A, 4B, 4C) and lower ring blocks (4B, 4C, 4D) are temporarily connected by means of a connection tool in advance before the ring blocks (4A, 4B, 4C, 4D) are welded and connected or cut, and thereby, the lower ring block (4B, 4C, 4D) is lifted and held on the upper ring block (4A, 4B, 4C) in at least one step of the step of assembling the new furnace body and the step of from dismantling of the old furnace body to assembling of the new furnace body. respective connection parts or cut parts of upper (4A, 4B, 4C) and lower ring blocks (4B, 4C, 4D) are temporarily connected by means of a connection tool in advance before the ring blocks (4A, 4B, 4C, 4D) are welded and connected or cut, and thereby, the lower ring block (4B, 4C, 4D) is lifted and held on the upper ring block (4A, 4B, 4C) in at least one step of the step of assembling the new furnace body and the step of from dismantling of the old furnace body to assembling of the new furnace body.