The invention relates to the field of extraction of puerarin, in particular to a multi-filtering device for extracting puerarin. The multi-filtering device comprises a box body, wherein a rotary shaftis arranged at left and right sides of the box body; the rotary shaft is provided with first gears; the lower sides of the first gears are engaged with second gears; a connection barrel is arranged at the middle end in the box body; flow guide plates are mounted at left and right sides of the connection barrel; blowdown pipes are mounted at the upper sides of the box body at the outer sides of the guide flow plates; a storage tank is arranged at the outer side of the lower end of the connection barrel; connection parts of the storage tank and the connection barrel are connected through a first filtering device; first separation plates are arranged at the left and right sides of the storage tank; second separation plates are arranged at the outer sides of the first separation plates; second filtering devices are arranged at the upper ends between the second separation plates and the first separation plates; third separation plates are arranged at the outer sides of the second separation plates; third filtering devices are mounted between the upper sides of the third separation plates and left and right side walls of the box body. By adopting the multi-filtering device provided by the invention, multi-filtering can be effectively and conveniently carried out by the device, and filtered impurities are convenient to discharge, so that the device is convenient to use.