Disclosed are a physical uplink control channel (PUCCH) power control method and device, which relate to the technique of communications. When a user equipment (UE) supports the transmission of a PUCCH on different uplink carriers corresponding to different carrier groups, an uplink carrier where the PUCCH is transmitted in a current uplink subframe is determined (S501); for each uplink carrier where the PUCCH is transmitted, based on a transmission power control (TPC) command received over at least one downlink carrier in at least one carrier group transmitting uplink control information (UCI) in the PUCCH on the uplink carrier in the current uplink subframe, the UE determines a power regulation cumulant corresponding to the PUCCH transmitted on the uplink carrier in the current uplink subframe (S502); and for each uplink carrier where the PUCCH is transmitted, according to a PUCCH power control parameter and the power regulation cumulant corresponding to the uplink carrier, the UE determines the transmission power of the PUCCH transmitted on the uplink carrier in the current uplink subframe (S503), thereby realizing the PUCCH power control.