The invention relates to the technical field of safety protectors, in particular to a novel safety door. The novel safety door comprises a guide track, a door plate and a housing, wherein the door plate is embedded in the guide track; the housing is sleeved outside the guide track; the guide track is arch-shaped; a pulley subassembly is arranged on the top of the guide track; and the door plate has a vertical structure and consists of an upper door and a lower door. The guide track is arch-shaped, the door plate has a combined structure and consists of the upper door and the lower door, so that a vertical movable opening and closing mode is realized, operation area is large, an adjusting form is flexible, large working space is provided for an operator, the operator operates the novel safety door conveniently, the efficiency of the operator is high, and the operator is protected thoughtfully, reliably and safely.