Cable bridge for power supply and distribution system and assembly method thereof

The invention discloses a cable bridge for a power supply and distribution system and an assembling method of the cable bridge. The cable bridge comprises first bridge bodies and second bridge bodies, the second bridge bodies are arranged between every two adjacent first bridge bodies, and the first bridge bodies and the second bridge bodies are each provided with a ventilation groove, a smoke sensor and a temperature sensor. A driving mechanism, a sealing mechanism and an air exchange mechanism are arranged on the first bridge body; a sealing mechanism is arranged on the second bridge body; when the smoke sensor or the temperature sensor detects smoke or temperature signals in the first bridge body and/or the second bridge body, the driving mechanism or the ventilation mechanism is controlled to work, and isolation between air in the first bridge body and the second bridge body and the external environment is achieved or air circulation is accelerated. According to the cable bridge, the switch of the ventila