The invention discloses a high-stability rebar straightening guillotine shear. The high-stability rebar straightening guillotine shear comprises a base. The right side of the base is provided with a sundry groove. A sundry box is arranged in an inner cavity of the sundry groove. A controller is fixedly installed at the top of the right side of the base. A fixed pipe is fixedly connected to the right side of the top of the base. A waste flock opening is formed in the top of the base and located in the left side of the fixed pipe. The bottom of the waste flock opening communicates with the top of the sundry groove. A guide pipe is fixedly connected to the top of the base and located on the left side off the waste flock opening. A discharge groove is formed in the top of the base and located in the left side of the guide pipe. According to the high-stability rebar straightening guillotine shear, through improvement of the fixed pipe, offset of the cutting position and inclining of a cutting face due to too large vibration during cutting operation are avoided. Through matched usage of the sundry groove, the sundry box, a turbofan, the guide pipe and the discharge groove, the automation degree of cutting operation is improved.