The invention belongs to the solar cell technical field and discloses a solar cell assembly system for urban landscape buildings. The solar cell assembly system comprises a solar cell assembly; the solar cell assembly comprises a solar cell frame and a solar cell package which is of a five-layer structure and is arranged in the solar cell frame; the solar cell package of the five-layer structure includes a back film layer, a first sealant layer, a composite type crystalline silicon solar cell layer, a second sealant layer and a glass layer which are sequentially stacked from bottom to top; thesecond sealant layer is a transparent sealant layer; and the composite type crystalline silicon solar cell layer includes a set of crystalline silicon solar cell sheets arranged in a rectangular array, and LED lamp strips which are arranged longitudinally or horizontally. The solar cell assembly system of the present invention can be used on the external walls or roofs of the buildings of a city,can be used not only for generating electricity, but also for beautifying the architectural landscape of the city at night, and has an environmental protection and energy-saving effect.