Ventilation system of underground cable hole

The utility model relates to a ventilation system of an underground cable hole. The ventilation device is suitable for the technical field of ventilation of electric power engineering. The technical problem to be solved by the utility model is to provide an economic and reasonable ventilation system of an underground cable hole, so as to solve the problems of ventilation, heat removal and smoke discharge after a fire disaster, realize that the environment temperature of a cable channel meets the requirement of safe operation, and ensure that the smoke is effectively discharged after the fire disaster. According to the technical scheme, the ventilation system of the underground cable hole is characterized in that the ventilation system comprises a smoke exhaust fan after disasters, a normal-time exhaust fan, a box-type full-automatic fire damper, an exhaust duct and a cable duct; the exhaust duct is located above the cable hole partition plate, and the cable duct is located below the cable hole partition plate