The invention discloses a feeding device for a reaction vessel. The feeding device comprises a material storage vessel, a valve mechanism, a connecting rod and a driving mechanism; the material storage vessel is provided with an opening end and a material output port; the valve mechanism performs opening and closing control on the material output port and is arranged at the material output port; the connecting rod drives the valve mechanism to be opened and closed, at least one part of the connecting rod is located in the material storage vessel, and one end of the connecting rod is connected with the valve mechanism; the driving mechanism enables the connecting rod to do rising and falling and/or rotating actions and is connected with the other end of the connecting rod or connected with the other end of the connecting rod in a work state and separated from the connecting rod in a non-work state. The feeding device has the advantages of being high in automation degree, capable of conveniently feeding materials, low in labor intensity, high in efficiency, capable of conveniently controlling the feeding amount, safe and reliable.