The invention provides a normal temperature black body radiance parameter calibration device and a normal temperature black body radiance brightness temperature measurement method. The device consistsof a first apparatus and a second apparatus. The first apparatus includes: a laser device, a light splitting sheet used for dividing laser light of the laser device into two paths, an optical wavelength meter for measuring laser light wavelength, a laser light power stabilizer, a spatial filter, an infrared integrating sphere, a displacement guide rail, a cryogenic radiometers and an infrared radiance brightness detector; the second apparatus is an infrared detector relative spectral response calibration device. A 3.39 [mu]m wavelength point commonly used for medium-wave infrared light is chosen as wavelength for infrared radiance brightness parameter calibration, wavelengths a 10.6 [mu]m wavelength point commonly used for long waves is chosen for long wave infrared light, an infrared radiance brightness detector is used as a tracing chain, radiance brightness parameters of normal temperature black body can be traced to the cryogenic radiometer, and radiance brightness uncertainty ofthe normal temperature black body is increased by nearly one order of magnitude.