A power control method includes: obtaining, by a first terminal, parameter information required for power control, where the parameter information includes at least one of a first parameter, a second parameter, and a third parameter; and determining, by the first terminal based on the parameter information, uplink transmit power used when uplink transmission is performed on a target beam or a target beam pair; where the first parameter includes a beam reception gain of a network device and/or a beam sending gain of the first terminal; the second parameter is used to indicate interference caused by a second terminal to the first terminal on the target beam; and the third parameter includes beam-specific target power and/or terminal-specific target power.