The invention discloses a power control method and device and relates to the technical field of mobile communication. The method comprises the steps that UE (User Equipment) calculates a first transmitting power value P1 according to a power control parameter issued by a base station; and the UE receives a second transmitting power value P2 and a third transmitting power value P3 sent by CPE (Customer Premises Equipment) and determines final transmitting power according to the P1, P2 and P3, or the UE receives a fourth power value P4 sent by the CPE and determines the final transmitting poweraccording to the P1 and P4.