The invention relates to the field of material conditioning, and discloses a conditioner. The conditioner comprises a machine frame; a cylinder is fixed on the machine frame; a first rotating shaft and a second rotating shaft are in rotation connection with the interior of the cylinder; spiral blades are synchronously arranged on the first rotating shaft and the second rotating shaft; a driving mechanism is arranged on the machine frame so as to drive the first rotating shaft and the second rotating shaft to synchronously rotate toward opposite directions; a first material-throwing part and asecond material-throwing part are respectively arranged for the first rotating shaft and the second rotating shaft; and a n isolation mechanism is arranged on the cylinder so as to block a first material outlet. During operation of the driving mechanism, when materials are moved from the first rotating shaft to the first material-throwing part, the materials are thrown onto the second rotating shaft; the materials on the rotating shaft are continuously pushed toward direction of the second material-throwing part by the spiral blades so as to be pushed onto the second material-throwing part; and then, the materials on the second material-throwing part is thrown onto the first rotating shaft again. The whole process is cyclic, so that the driving mechanism is operated to be stopped when conditioning on the materials completes so as to achieve relatively high material uniformity after conditioning; and thus, the conditioner has the effect of adjustable conditioning time according to demands, and is significant in effects.