Abstract: A thermal pyrolysis apparatus includes at least one pyrolysis device. The pyrolysis device includes an inlet, an outlet and a pyrolysis chamber. A conveying unit is provided in the pyrolysis chamber. The pyrolysis device has a casing with thermal oil circulated in the casing. An oil gas collecting unit is disposed on top of the casing and interconnected with the pyrolysis chamber. The pyrolysis chamber of the present invention provides a better closed effect, which can be heated evenly and won't be oxidized easily. The present invention can be applied to recycle waste rubbers or waste tires.