The invention provides a reflux brazier soldering flux collection device and a using method thereof. The collecting device comprises at least two collecting units with a same structure, a tee inlet pipeline and a ventilation pipeline, wherein the collecting units are connected in series sequentially, every collecting unit comprises a heat exchange post and a collecting bottle, and each collectingbottle is arranged below the heat exchange post and is communicated with the heat exchange post; the heat exchange posts comprise post bodies and cooling water pipelines arranged in the post bodies; air inlets and air outlets are arranged on the post bodies, the air inlet of the first heat exchange post is connected with the tee inlet pipe, the air outlet of the previous heat exchange post is connected with the air inlet of the latter heat exchange post, and the air outlet of the last heat exchange post is connected with the ventilation pipeline. The using method comprises the steps of recovering soldering flux and cleaning the heat exchange posts. The reflux brazier soldering flux collection device has the advantage of good collection effect and the function of automatic cleaning, and the service life of the reflux brazier soldering flux collection device is more than five times of that of the traditional collection device.