A discharging device of a roller kiln comprises a discharging roller way (2), a discharging transmission system (5), a first driving mechanism and a second driving mechanism; the first driving mechanism and the second driving mechanism both drive the discharging roller way (2) to rotate through the discharging transmission system (5), the first driving mechanism is a continuous non-intermittent driving module, and the second driving mechanism is a manual intermittent driving module; the second driving mechanism will intermittently exert driving force larger than that of the first driving mechanism to the discharging transmission system (5) and replaces the driving action of the first driving mechanism, and therefore the discharging roller way (2) can intermittently generates the acceleration rotation state; and the roller kiln comprises a kiln roller way (1), a kiln transmission system (4), a roller kiln driving system and the above discharging device. The discharging device is connected to a discharging opening of the roller kiln, and the discharging roller way (2) is in abut joint with the kiln roller way (1). According to the discharging device, the pushing speed of a workpiece or material bowl can be adjusted, and the work efficiency is improved.