A scheme is proposed to obtain the cold atom temperature by using atomic absorption spectrometry obtained based on Raman pump-probe technique, and the proposed scheme is applied to the magneto-optical trap of 85Rb atoms. In experiment, the stimulated Raman transition of atoms occurs as the trapping and probe lasers interact with the cold atoms simultaneously. Dispersion-like peaks of sub-natural linewidth are generated. By fitting the dispersion-like peaks with theoretical model, the temperature of trapped cold 85Rb atoms is estimated, which is about 230 μK. Compared with the time-of-flight measurement method, the scheme provides a relatively simple method to estimate cold atom temperature.