This application provides a communication method and device in a wireless local area network. The communication method includes: A receive end receives indication information from a transmit end, where a buffer of the receive end stores a log-likelihood ratio (LLR) corresponding to coded bits in an aggregated media access control protocol data unit (A-MPDU) subframe including a target media access control protocol data unit (MPDU). The receive end discards the LLR corresponding to the coded bits in the A-MPDU subframe including the target MPDU according to the indication information. According to the technical solutions provided in this application, the LLR corresponding to the coded bits in the buffer of the receive end can be discarded in time, thereby improving throughput of a system and reducing memory requirements.