The utility model provides a generating set is instrument for barring, including the gear shaft, right set, supporting sleeve, driving medium, the supporting ways is established and is put in setting upright or straight, sets upright or straight the ways and establishes on the gear shaft, installs the driving medium in the one end of keeping away from the gear on the gear shaft, it lies in between epaxial gear of gear and the driving medium to set upright or straight the cover. The utility model provides a generating set is instrument for barring can install in engine flywheel shell preformed hole department, realizes the barring action, and the performance is practical, the outward appearance is succinct, easy and simple to handle, low price, other injuries of having stopped barring in -process potential safety hazard or having caused.