The invention discloses a dropper furnace for tests, and a self-cooling sealing device thereof, and relates to the field of dropper furnaces for tests. The dropper furnace for tests comprises a reaction tube, a feeding tube, at least one secondary air inlet tube, a sampling tube and the self-cooling sealing device. The self-cooling sealing device comprises a separated heat pipe. The separated heatpipe is composed of a heat pipe condensation segment, a first heat pipe evaporation segment and a second heat pipe evaporation segment. The dropper furnace for tests, and the self-cooling sealing device thereof are used for overcoming the defect that a cooling device at the position of a seal washer of an existing dropper furnace for tests is high in operation and maintenance cost, and compared with a traditional tap water circulation cooling manner, the operation and maintenance cost is lower.