The present invention relates to a tool for preventing the rotation of a plate of a bush-cutting machine to prevent an elastic member from being damaged. The tool for preventing the rotation of a plate of a bush-cutting machine includes: an elastic member (120) disposed between a working platform and a blade-protecting plate an impact buffer member (140) hooked onto the lower end of the elastic member and coupled to one side of the blade-protecting plate and a cylindrical tube (110) surrounding the elastic member and the impact buffer member. A plate-coupling part (141) is disposed on the lower portion of the impact buffer member (140), and an elastic-member-coupling part (142) is disposed on the upper portion thereof. A cutting part (143) is disposed on one side of the intermediate portion between the plate-coupling part (141) and the elastic-member-coupling part (142). A hook (141a) protrudes from one side of the plate-coupling part (141) so as to hook onto the lower end of the cylindrical tube (110). According to the present invention, the hook may protrude from the side of the plate-coupling part so as to hook onto the lower end of the cylindrical tube. Thus, even though the parts are sold separately, a user will have no difficulty in terms of workability. Also, since the widths of the plate-coupling part and of the elastic-member-coupling part are equal to the inner diameter of the cylindrical tube, a gap does not occur between the impact buffer member and the cylindrical tube, thereby preventing the impact buffer member from being shaken within the cylindrical tube. Thus, the impact buffer member may have good durability. Also, the elastic member may be prevented from being separated by the cutting part of the impact buffer member.La présente invention porte sur un outil pour empêcher la rotation dune plaque dune machine de débroussaillage pour empêcher un élément élastique dêtre endommagé. Loutil pour empêcher la rotation dune plaque dune machine de débroussa
