The application provides a data processing method and device. The first equipment obtains CB number C after performing CB segmentation on TB according to the size of the TB, determines the CB number included by each CBG according to the CBG number and the CB number included by the pre-acquired TB, and then determines the time domain symbol number for bearing the data of each CBG in the first timefrequency resource according to the CB number included by each CBG and the time domain symbol number in the first time frequency resource, and finally maps the data of each CBG to the first time frequency resource according to the time domain symbol number for bearing the data of each CBG, thereby guaranteeing that each CBG is mapped to one or multiple complete time domain symbols. Since the dataof each CBG is mapped to one or multiple complete time domain symbols, the condition that the data of two CBGs on one time domain symbol is avoided; when the URLLC service data preempts the time frequency resource of the eMBB service data, the resource occupying one time domain symbol only influences the transmission of one CBG and cannot simultaneously influence the transmission of two CBGs, andthe transmission efficiency of the eMBB service data can be effectively improved.