The invention relates to a measurement anti-interference device for radiant panel thermometers. The measurement anti-interference device comprises a light transmitting tube, light transmitting holes are arranged in the light transmitting tube, the upper end of the light transmitting tube is connected with a radiant panel thermometer by a flange, and the lower end of the light transmitting tube isarranged above strip steel when the device is used; and the device is characterized in that the light transmitting tube is sleeved with an inner sleeve, a water inlet cavity is defined by the inner sleeve and the light transmitting tube; the inner sleeve is sleeved with an outer sleeve, and a water discharge cavity is defined by the outer sleeve and the light transmitting tube; the inside of a water-cooled dish cover is provided with a spiral water channel, a bottom water outlet on the inner sleeve is communicated with an inner port of the spiral water channel, and a water outlet on the water-cooled dish cover is communicated with an external port of the spiral water channel; and the water outlet on the water-cooled dish cover is communicated with a bottom water inlet on the outer sleeve by a connecting water pipe. The device provided by the invention has the advantages of simple structure and long service life and is easy to maintain.