Double-layer metal roof

The utility model discloses a double-layer metal roof, relates to the technical field of buildings, and aims to solve the problem that the cooling effect of an air conditioner in a venue is affected due to the fact that the uppermost metal composite layer gradually reaches a higher temperature and the temperature difference is larger and more heat enters the venue through a heat preservation cotton layer when the weather is hot. The double-layer metal roof comprises a roof layer and an upper metal layer, an inclination angle is formed between the roof layer and the horizontal plane, the upper metal layer is arranged below the roof layer and fixedly connected with the roof layer through a first connecting assembly, an air convection layer is formed between the upper metal layer and the roof layer, and the air convection layer is communicated with the outside atmosphere. The double-layer metal roof is used for reducing heat transfer from the roof to the interior of a venue when the temperature of the surface la