Disclosed are a data packet processing method and apparatus in an OFDMA system, and a storage medium. The method includes: performing code block segmentation on a source data packet to obtain d data blocks; respectively adding a CRC sequence to the d data blocks; respectively performing error correction coding; grouping the d data blocks on which the error correction coding is performed to obtain a information data packets; performing packet coding on the a information data packets to obtain b check data packets; performing constellation mapping modulation to obtain a first modulation symbol sequence with a length of k1 corresponding to the a information data packets and a second modulation symbol sequence with a length of k2 corresponding to the b check data packets; mapping the first and the second modulation symbol sequences to Mofdm1 continuous OFDM symbols and Mofdm2 continuous OFDM symbols according to time orders respectively for sending.