The invention relates to the field of furnace structures, aims to solve the problem that a furnace in the prior art is long in heating time and poor in effect, and provides a drying furnace. The drying furnace comprises a furnace body, a lifting door system, a plurality of trolleys used for bearing to-be-dried parts, a heating system and a humidity elimination system, wherein the furnace body is provided with a drying chamber of which one end is open; the lifting door system comprises a door frame and a furnace door; the furnace door is movably mounted on the door frame and can close or open the opening of the drying chamber through lifting; the plurality of trolleys are tightly arranged in the drying chamber in a first direction; isolation plates are arranged between two bearing tables ofthe trolleys; an annular channel is formed in the drying chamber through isolation of the isolation plates; the heating system comprises a heating machine; the heating machine communicates with the annular channel and can generate a heating air current circulating in the annular channel; and the humidity elimination system comprises a humidity elimination fan which communicates with the annular channel. The drying furnace has the beneficial effects that the to-be-dried parts are heated and dried through thermal convection heating air circulating in the annular channel, drying efficiency is high, consumed time is short, and the floor space is saved.