The invention discloses a reusable gear wheel. The reusable gear wheel comprises a wheel disc and gear wheel blocks. A mounting ring is disposed in the center of the wheel disc, and fixing pin holes are formed in the mounting ring; circular holes in a round are formed in the outer side of the wheel disc; each gear wheel block is in a circular arc shape; wheel teeth are disposed on the outer sides of the gear wheel blocks; circular-arc-shaped grooves are formed in the inner sides of the gear wheel blocks; each gear wheel block is fixedly connected to the wheel disc through two bolts; the number of the gear wheel blocks is one half of the number of the circular holes in the wheel disc; the radius of the circular-arc-shaped grooves in the inner sides of the corresponding gear wheel blocks is equal to that of the wheel disc; and the width of the circular-arc-shaped grooves in the inner sides of the corresponding gear wheel blocks is equal to the thickness of the wheel disc. The reusable gear wheel has the advantages of being simple in structure, reasonable in design, recyclable, capable of saving materials, easy to apply and popularize and the like.