The present finding concerns a cutting group for a rotary hoeing machine, which comprises a fixed flange (3) able to be rigidly centrally fixed to the rotary driven shaft (2) of a rotary hoeing machine and one or more hoes (7) which can be rigidly fixed to the fixed flange (3) through removable holding means (10). The aforementioned fixed flange (3) is perimetrically provided with a plurality of first through holes (4) able to align with second through holes (5) foreseen in each hoe (7). The removable holding means (10) comprise an annular plate (11) provided with a plurality of projecting pins (12) able to insert in the aforementioned first and second holes (4, 5) aligned to fixedly connect the hoes to the fixed flange (3). The removable holding means (10) also comprise a bushing (15) fixedly attached to the shaft (2) and provided with external threading, and a fastening bush (16) provided with internal threading with the purpose of engaging by screwing onto the external threading of the bushing (15) going into abutment on the annular plate (3) to compress the hoes (7) against the fixed flange (3).
