The invention discloses a hot trap system for purifying a high-temperature lithium circuit. The hot trap system comprises a lithium storage tank for containing liquid lithium, a lithium recovery tankfor recovering purified lithium, a pipeline connected between the lithium storage tank and the lithium recovery tank, an electromagnetic pump arranged on the pipeline, and a set of hot trap devices arranged on the pipeline and used for purifying lithium. The hot trap system is suitable for online purifying the lithium circuit, and works stably and reliably; the whole hot trap system has a small size, and does not contain special structural components, so the system is easy to process and manufacture; and the system has a far better purifying effect than other existing purifying methods .