Cascading style centralized heating curing barn

The utility model discloses a cascading style centralized heating curing barn which comprises a heating room (1), a curing barn group (2), a hot air passage (3), a dehumidification passage (4) and heated air circulation passages (5), wherein, a boiler with a radiator (6) and a ventilator (7) are arranged in the heating room (1); the heating room (1) is connected with the curing barn group (2) through the hot air passage (3) so as to form a heating and heat supply system; the humidity outlets of all curing barns of the curing barn group (2) are connected with the heating room (1) through the dehumidification passage (3) so as to form a dehumidification recovering system; the curing barn group is composed of conjoined unit curing barns; each curing barn is provided with a tobacco rack (8), a tobacco loading door and an observation window; the heated air circulation passages (5) between the adjacent unit curing barns are connected end to end so as to form a hot air circulatory system; and the humidity return pas