The present invention is composed of two horizontal frame 4, two vertical frames 5 each connected to combine the opposite ends of which are respectively mounted on upper and lower portions to be assembled door panel inwardly relates to a fire door that does not require welding processes and is in a fire door frame is configured to be opened and closed by a hinge (7), the horizontal frame extends in the 4-length direction to its end, the at least one fixing rod 41 is threaded is formed, the horizontal frame 4 both the adjacent end through at least one fixing hole 51, the fixing hole 51 formed at the opposite ends of the vertical frame 5, the end of the fixing bar 41 so that corresponding to the insertion fixing bar of binds to the end of the 41 tightening nut 55 is further configured to frame assembly consisting of, which is formed at a position corresponding to a cylinder wad to be formed on the door panel at one side of the vertical frame 5 But having assembled the cylinder insertion hole 52 and the cylinder insertion hole 52 is fixedly mounted cylindrical gusset (6) cylinder reinforcing plate of the door panel frame consisting of which the parts of the cylinder reinforcing plate assembly comprises: the one projecting to the inside inserting the projections are the more the insertion projection 53 is formed is a cylinder insertion hole 52 to be perforated, the insertion hole 61 which is attached to the cylinder insertion hole 52 corresponding to the insertion projections 53 are formed ( 53) it is characterized in that the insert consisting of a cylindrical reinforcement plate 6 is fixed by being bent.
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