Disclosed are an urban rail traffic prefabricated assembly O-shaped beam and an overpass comprising the urban rail traffic prefabricated assembly O-shaped beam. The urban rail traffic prefabricated assembly O-shaped beam comprises a beam body. The beam body comprises a prefabricated bottom board, a web and an upper cover board. The bottom board, the web and the upper cover board are connected together to form a channel having an O-shaped cross section. Multiple rail bearing platforms are provided at the top of the bottom board in the length direction of the bottom board. Multiple cable supporting bodies are provided on the inner side of the web in the length direction and the height direction of the web. The upper cover board is provided with lighting windows, a preserved hole used for device and material transportation during a construction and operation period, and a power supply apparatus.
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