A heat dissipating structure for an iron-sheet house includes two frames fixed to left and right sides of a roof. The frames define a ventilation space in communication with an inside of a house including the roof. Each frame includes a hollow interior, at least one lower opening communicating the hollow interior with an outside of the house, and at least one vent communicating the hollow interior with the ventilation space. The frames are interconnected by connecting members. Two adjacent connecting members respectively have two mutually facing grooves. A shielding plate is mounted between two adjacent connecting members and is fixed to upper ends of the frames to cover the ventilation space, with the shielding plate including front and rear ends respectively engaged in the two mutually facing grooves respectively of the two adjacent connecting members and bonded to the two adjacent connecting members by silicon glue.
