The invention provides a blade-replaceable material crushing device. The blade-replaceable material crushing device comprises a box body and a base, wherein feed hoppers, a first rotating shaft, crushing teeth, vibrators, a sieve plate, a second rotating shaft and a box door are arranged on the box body; the upper end of the first rotating shaft penetrates the box body, a plurality of crushing blades are arranged on the first rotating shaft, and a first motor is arranged at the upper end of the first rotating shaft; the plurality of crushing blades are arranged at equal intervals, and each crushing blade comprises a circular cutterhead; grooves are formed in each circular cutterhead, and a mounting hole is formed in the center of each cutterhead; the number of the grooves in each circular cutterhead is 3-5, the 3-5 grooves are uniformly distributed on each circular cutterhead, a lock screw notch is formed beside each groove, and a cutter is mounted in each groove; the second rotating shaft is arranged at the lower end of the sieve plate, stirring rods are arranged on the second rotating shaft, the right end of the second rotating shaft penetrates the box body, and a second motor is arranged at the right end of the second rotating shaft; and the base is fixed at the lower end of the box body, and a rubber layer is arranged on the base. The blade-replaceable material crushing device has the advantages that the blades can be replaced, iron can be removed, the crushing is radical, stirring for crushing can be performed and vibration can be reduced.