The invention discloses a fire exit door which comprises a placing groove formed in a wall surface, wherein the inner wall of the placing groove is fixedly connected with a positioning rod, a gear rotates on the surface of the positioning rod in a limiting mode, a rack I meshes with the upper surface of the gear, a rack II meshes with the lower surface of the gear, a side plate I is fixedly connected to the left end of the rack I, the right end of the rack II is fixedly connected with a side plate II, and the rear sides of the side plate I and the side plate II slide on the front side of the wall surface in a limiting mode. According to the fire exit door, through the matching use between the structures, the problems that in the actual use process, the opening and closing angle of a traditional hidden door is not large enough, the opened door can block the sight line, opening and closing of the hidden door is not convenient enough, in addition, shaking is prone to occurring and inconvenience is brought to users due to the fact that the end of a water pipe externally connected to the hydrant is difficult to be effectively fixed in the hidden door when a hydrant is used are solved.