The utility model provides a pyrometer protective cover for rolled plate detection, which belongs to the field of element protection and comprises a protective cover base body used for accommodating apyrometer and provided with a high-pressure air pipe connector on the side wall and a mounting base used for external mounting. The top cover is fixedly arranged at the top of the protective cover base body, and a cable through hole for a cable of the pyrometer to pass through is formed in the center of the top cover; the three damping units are fixed to the pyrometer at equal intervals, fixing rods capable of elastically operating in the vertical direction are arranged on the damping units, the three fixing rods are located on the same plane, and the included angle between every two fixing rods is 120 degrees, and the three fixing rods are fixed to the protective cover base body. According to the pyrometer protective cover for rolled plate detection, the influence of mist and vibration on a pyrometer can be effectively avoided through damping of the damping unit and purging of high-pressure air, the effect is particularly remarkable in a low-temperature environment, the structure issimple, manufacturing is easy, practicability is high, the scrap steel rate is reduced, and the service life of elements is prolonged.