The invention discloses an ultramicro crushing machine for wild radix pueraiae. The ultramicro crushing machine for the wild radix pueraiae comprises a bottom plate, a feeding mechanism, a stirring device and a grinding chamber. The stirring device is arranged in the middle above the bottom plate. The feeding mechanism is arranged above the left side of the stirring device. A second drive motor isarranged above the stirring device. The output end of the second drive motor is connected with a transmission device. The transmission device is located above a partition which is located on the upper portion inside the stirring device. The lower portion of the transmission device penetrates the partition to be rotationally connected with a plurality of second stirring shafts, and the lower endsof the second stirring shafts are provided with a plurality of transverse cutting disks. A plurality of vertical cutting disks are arranged below the second stirring shaft and located above a first filter net, and the first filter net is located on the lower portion inside the stirring device. The ultramicro crushing machine is simple in structure, good in crushing effect, high in production effect, capable of achieving automatic production and beneficial to popularization.