The invention belongs to the technical field of plant extracting, pretreating and mixing devices, and in particular relates to a plant extracting, pretreating and mixing device which comprises a sealed tank. An L-shaped feeding pipe is arranged on one side of the sealed tank, a spiral pipe is arranged at the lower end of a vertical portion of the L-shaped feeding pipe and connected with the same in a manner of being capable of rotating circumferentially through a connecting member, a rotating shaft is arranged at the bottom of the sealed tank below the spiral pipe, a fixing cap is arranged above the rotating shaft and connected to the top of the same in a threaded manner, a fixing column is connected onto the fixing cap in a threaded manner, multiple air injection pipes penetrating the sealed tank are distributed on the side wall of the sealed tank at different horizontal heights, and a liquid discharging pipe is arranged on the outer wall of the sealed tank. The device is reasonable in structural design and simple to operate, and staying time of suspension liquid in the sealed tank which is small in size can be prolonged as much as possible to enable the suspension liquid to be fully mixed, so that extraction of active ingredients is facilitated.