The invention provides a rapid connecting device for a vertical stirrer, a vertical stirrer group and a rapid vertical stirrer and transmission shaft connection and disconnection method. The rapid connecting device comprises a first connecting part, a second connecting part and a fixing part, wherein the first connecting part is connected with a transmission shaft; a connecting disc is arranged atthe bottom of the first connecting part; the upper part of the second connecting part is a transition disc; connecting holes connected with vertical stirrers are formed in the lower part of the second connecting part; when the first connecting part is arranged on the second connecting part, the transition disc is in contact with the connecting disc, and concave-convex clamping parts which are meshed with each other are formed between the contact surfaces; the fixing part is used for fixedly connecting the transition disc with the connecting disc in an annular direction. By adopting the rapidconnecting device, rapid separation of the transmission shaft from the vertical stirrers is achieved.