Method for reporting power headroom, method for receiving power headroom, user equipment, base station, medium and system are provided. The method for reporting power headroom includes: determining a first carrier and a first time slot corresponding to the first carrier for transmitting a PHR; acquiring a first time slot group corresponding to at least one other carrier, wherein the first time slot group includes N time slots, uplink data transmission is performed in at least one of the N time slots, N is a positive integer, and the first time slot includes the first time slot group in a time domain; generating the PHR based on power headroom corresponding to die first time slot and power headroom corresponding to the first time slot group; reporting the PHR to a base station using the first time slot. Power headroom corresponding to different carriers may be accurately reported to the base station.