The invention discloses a cold light source cutting device for processing a light-resistant screen, and belongs to the technical field of light-resistant screens. The cold light source cutting devicecomprises a base, wherein a first side plate base is fixedly connected to the top of the base, a first bearing is clamped on the side surface of the first side plate base, and an adapter shaft is sleeved with the first bearing. According to the cold light source cutting device for processing the light-resistant screen, under the mutual cooperation of the designed structures such as a first hot ironing roller, a second hot ironing roller, a cold ironing roller, a pressing plate, a supporting spring, a lifting base, a connecting sleeve, toothed plates, a gear and a connecting frame, a certain pulling effect can be achieved on a to-be-cut light-resistant screen flatly laid on the base, it can be avoided that a cut part deforms under heat and affects the flatness of a non-cut part, it can be avoided that the to-be-cut light-resistant screen deforms under instantaneous overhigh heat when the to-be-cut light-resistant screen is subjected to the action of a cold light source laser cutter, theflatness of the cut part of the cut light-resistant screen can be ensured, and the stability of the light-resistant screen is rapidly stabilized by utilizing cold ironing.