The invention belongs to the field of tunnel kiln waste heat recovery and relates to a tunnel kiln device for recovering waste heat from a calcium carbide pot and an application. The device comprises a kiln car track, a medium temperature chamber and two high temperature chambers, wherein kiln cars enter the medium temperature chamber through the kiln car track, then enter the high temperature chambers from the medium temperature chamber and are forcibly cooled through tuyeres of external air blowers, hot air is discharged into high temperature air channels through hot air outlets in the top centers of the high temperature chambers, the kiln cars are cooled to a certain temperature and then pushed out through the medium temperature chamber, and the medium temperature chamber aims at preventing the outside from communicating with the high temperature chambers and preventing loss of heat. The tunnel kiln device has the beneficial effects as follows: the provided waste heat recovery device can recover a large amount of heat, and effects of energy conservation and emission reduction are realized; the medium temperature chamber is used for separating the outside from the high temperature chambers, and loss of heat is reduced; the tuyeres are controlled by the temperature to be opened and closed, and accordingly, the comprehensive benefit of electric energy utilization and waste heat recovery is improved.