The medium wave infrared channel (MWIR) has the characters of high precision on-orbit calibration and reflectance computation insensitive to the top of atmospheric (TOA) temperature, which make it a suitable reference standard for reflectance validation between bands. The glint area on the sea surface has the characters of relatively high reflectivity, high frequency and uniform surface performance, which make it a suitable test site for on-orbit validation of satellite sensors. Based on the two starting points, this paper first built up the reflectance relationship between MWIR and solar reflectance bands based on Fresnel’s law, then used VIIRS (Visible Infrared Imaging Radiometer) mid-infrared band (3.697μm) as reference standard to validate the four solar reflectance bands (0.672、0.862、1.238 and 1.602μm) on sea surface sun glint regions, and finally analyzed the uncertainties of this validation model. The results show that the uncertainties of the four solar reflectance bands are 3.8%、3.9%、4.1%、4.1%, respectively. Therefore, the model proposed in this paper can be used for optical inter band cross validation.