A reflow oven, said reflow oven comprising a reflow oven hearth, and said reflow oven hearth comprising a gas outlet and a gas inlet, characterized in that said reflow oven further comprises: a separator, said separator comprising a separator inlet and a separator outlet, and said separator inlet being connected to said gas outlet of said reflow oven hearth so that the gases in said reflow oven hearth can flow into said separator, and being characterised by: a zeolite box, said zeolite box comprising a zeolite box inlet and a zeolite box outlet, said zeolite box inlet being connected to said separator outlet, and said zeolite box outlet being connected to said gas inlet of said reflow oven hearth so that the gases flowing through said separator can enter said zeolite box and the gases flowing through said zeolite box can flow from said zeolite box outlet back to said reflow oven hearth, wherein the zeolite box comprises: a box body, said box body having a chamber and an opening, an inner net cage, said inner net cage being detachably mounted in said chamber through said opening, gas openings (628.1 and 628.2) being provided in at least two side walls (324.1 and 324.2) of the inner net cage, said inner net cage containing a plurality of zeolites, and said gas openings (628.1 and 628.2) having such a size that they can block said plurality of zeolites, and a box cover, said box cover sealing said opening. a separator, said separator comprising a separator inlet and a separator outlet, and said separator inlet being connected to said gas outlet of said reflow oven hearth so that the gases in said reflow oven hearth can flow into said separator, and being characterised by: a zeolite box, said zeolite box comprising a zeolite box inlet and a zeolite box outlet, said zeolite box inlet being connected to said separator outlet, and said zeolite box outlet being connected to said gas inlet of said reflow oven hearth so that the gases flowing through said separator can enter said zeolite box and the gases flowing through said zeolite box can flow from said zeolite box outlet back to said reflow oven hearth, wherein the zeolite box comprises: a box body, said box body having a chamber and an opening, an inner net cage, said inner net cage being detachably mounted in said chamber through said opening, gas openings (628.1 and 628.2) being provided in at least two side walls (324.1 and 324.2) of the inner net cage, said inner net cage containing a plurality of zeolites, and said gas openings (628.1 and 628.2) having such a size that they can block said plurality of zeolites, and a box cover, said box cover sealing said opening. a zeolite box, said zeolite box comprising a zeolite box inlet and a zeolite box outlet, said zeolite box inlet being connected to said separator outlet, and said zeolite box outlet being connected to said gas inlet of said reflow oven hearth so that the gases flowing through said separator can enter said zeolite box and the gases flowing through said zeolite box can flow from said zeolite box outlet back to said reflow oven hearth, wherein the zeolite box comprises: a box body, said box body having a chamber and an opening, an inner net cage, said inner net cage being detachably mounted in said chamber through said opening, gas openings (628.1 and 628.2) being provided in at least two side walls (324.1 and 324.2) of the inner net cage, said inner net cage containing a plurality of zeolites, and said gas openings (628.1 and 628.2) having such a size that they can block said plurality of zeolites, and a box cover, said box cover sealing said opening. a box body, said box body having a chamber and an opening, an inner net cage, said inner net cage being detachably mounted in said chamber through said opening, gas openings (628.1 and 628.2) being provided in at least two side walls (324.1 and 324.2) of the inner net cage, said inner net cage containing a plurality of zeolites, and said gas openings (628.1 and 628.2) having such a size that they can block said plurality of zeolites, and a box cover, said box cover sealing said opening.