A method and an apparatus for reporting buffer status are provided. The method includes: obtaining multiple Transport Blocks (TBs) from a base station within one Transmission Time Interval (TTI); selecting a TB compliant with a condition of transmitting a Buffer Status Report (BSR) among the multiple TBs; and bearing a BSR of a Logical Channel Group (LCG) and a Control Element (CE) sub-header of the BSR onto the selected TB and sending the TB to the base station. In this way, a UE can make full use of the padding bits of the obtained multiple TBs, and report the buffer status flexibly.