Round steel guillotine shear with stable clamping function

The utility model discloses a stable clamping round steel guillotine shear, which relates to the field of bolt production equipment, and comprises a workbench and a fixed plate, the top of the workbench is fixedly connected with a support plate, and the top of the support plate is fixedly provided with a top plate. According to the round steel cut-off machine capable of stably clamping, through the arrangement of the fixing plate and the positioning and clamping mechanism, the situation that cut-off openings are uneven due to the fact that the position of round steel deviates can be effectively prevented when the round steel is conveyed through the cut-off machine, and therefore the rejection rate of the round steel is reduced to a certain degree; meanwhile, due to the fact that the cutting mechanism and the conveying mechanism jointly use one motor to rotate, the conveying mechanism cannot convey the round steel when the cutting mechanism cuts the round steel, and similarly, the cutting mechanism cannot cut