A method for reporting power headroom, performed by a User Equipment, UE, and comprising: determining (S201) a first carrier and a first time slot corresponding to the first carrier for transmitting a power headroom report, PHR; acquiring (S202) a second time slot for receiving transmission grant information and corresponding to at least one other carrier, wherein the transmission grant information is used to indicate to perform uplink data transmission in a third time slot; acquiring (S203) the third time slot which the uplink data transmission is performed in and corresponds to the at least one other carrier, wherein the third time slot overlaps with the first time slot in a time domain; determining (S204) whether a time difference between the second time slot and the first time slot is less than a preset threshold; rejecting (S205) reporting power headroom corresponding to the third time slot, if the time difference between the second time slot and the first time slot is less than the preset threshold; and if the time difference between the second time slot and the first time slot is greater than or equal to the preset threshold, generating (S206) the PHR based on the power headroom corresponding to the first time slot and the power headroom corresponding to the third time slot, and reporting the PHR to the base station using the first time slot, characterized in that the method further comprises: receiving signaling from the base station, where the signaling comprises a preset threshold parameter; and determining the preset threshold based on the preset threshold parameter. determining (S201) a first carrier and a first time slot corresponding to the first carrier for transmitting a power headroom report, PHR; acquiring (S202) a second time slot for receiving transmission grant information and corresponding to at least one other carrier, wherein the transmission grant information is used to indicate to perform uplink data transmission in a third time slot; acquiring (S203) the third time slot which the uplink data transmission is performed in and corresponds to the at least one other carrier, wherein the third time slot overlaps with the first time slot in a time domain; determining (S204) whether a time difference between the second time slot and the first time slot is less than a preset threshold; rejecting (S205) reporting power headroom corresponding to the third time slot, if the time difference between the second time slot and the first time slot is less than the preset threshold; and if the time difference between the second time slot and the first time slot is greater than or equal to the preset threshold, generating (S206) the PHR based on the power headroom corresponding to the first time slot and the power headroom corresponding to the third time slot, and reporting the PHR to the base station using the first time slot, characterized in that the method further comprises: receiving signaling from the base station, where the signaling comprises a preset threshold parameter; and determining the preset threshold based on the preset threshold parameter. receiving signaling from the base station, where the signaling comprises a preset threshold parameter; and determining the preset threshold based on the preset threshold parameter. <EOS>