The utility model discloses a rapid cleaning tool for foreign matters adhered to external threads of a reinforcing steel bar head and an embedded bolt. The grinding device comprises a first semi-cylinder grinding device, a second semi-cylinder grinding device, an adjustable bolt assembly and an adjustable handle. The first semi-cylinder grinding device comprises a first semi-cylinder grinding ring, a first annular connecting piece and a first vertical connecting rod. The second semi-cylinder grinding device comprises a second semi-cylinder grinding ring, a second annular connecting piece and asecond vertical connecting rod, and the first annular connecting piece and the second annular connecting piece are adjustably connected through an adjustable bolt assembly; therefore, the connectingposition between the vertical rod piece and the handle can be adjusted through the nut so as to adapt to reinforcing steel bar wire heads with different calibers, embedded bolts and the like, and theconnecting device has the advantages of being stable in structure, flexible in adjustment, convenient to manufacture, high in efficiency, capable of reducing construction cost and the like.