The invention relates to a remelting furnace, which comprises: a soldering part, the soldering part is configured to process a printed circuit board to be soldered, and is provided with n soldering zones;The purification zone includes m purification zones, in which each of M purification zones is connected with one of N brazing zones, and M is less than or equal to n;One controllable discharge pipeline and K discharge bypass pipelines, in which K discharge bypass pipelines enable one of M purification zones to communicate with the controllable discharge pipeline;And a valve device configured to be connected with the outlet of the controllable discharge pipeline at its inlet to control the opening / closing of communication between the controllable discharge pipeline and the external environment. The remelting furnace can be operated in air mode and inert gas mode.Abstract figure: Figure 1
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