Deformation joint structure of roof waterproof system

The utility model discloses a deformation joint structure of a roof waterproof system, which relates to the technical field of roof structures, and comprises two steel plates and a deformation joint main body, the deformation joint main body is positioned between the two steel plates, protective layer components are paved on the top surfaces of the two steel plates, first waterproof coiled materials are arranged on the two protective layer components, and a second waterproof coiled material is arranged on the first waterproof coiled materials. The deformation joint body is coated with the first waterproof roll, and the protective layer assembly comprises an isolation layer laid on the steel plate. According to the deformation joint structure of the roof waterproof system, the first waterproof coiled materials arranged on the two protective layer assemblies are utilized, so that the first waterproof coiled materials can wrap the deformation joint main body, and the effect that the first waterproof coiled mater