A power control method, wherein the method comprises: obtaining, by a first terminal, power control information, wherein the power control information is information used to control a transmit power used by the first terminal when the first terminal communicates with a second terminal, and a first communication link is established between the first terminal and the second terminal; determining, by the first terminal, a target transmit power based on the power control information; and sending, by the first terminal, first data to the second terminal based on the target transmit power; wherein, the power control information is information used by the first terminal to control a transmit power used by the first terminal when the first terminal communicates with the second terminal, and either: the power control information is determined by a network device based on a receive power value of the second terminal sent by the second terminal and received by the network device, wherein the receive power value of the second terminal is a power value of a signal that is sent by the first terminal on the first communication link and that is received by the second terminal; or: the power control information is determined by the second terminal based on a receive power value of a network device sent by the network device and received by the second terminal, wherein the receive power value of the network device is a power value of a signal that is sent by the first terminal on the first communication link and that is received by the network device. obtaining, by a first terminal, power control information, wherein the power control information is information used to control a transmit power used by the first terminal when the first terminal communicates with a second terminal, and a first communication link is established between the first terminal and the second terminal; determining, by the first terminal, a target transmit power based on the power control information; and sending, by the first terminal, first data to the second terminal based on the target transmit power; wherein, the power control information is information used by the first terminal to control a transmit power used by the first terminal when the first terminal communicates with the second terminal, and either: the power control information is determined by a network device based on a receive power value of the second terminal sent by the second terminal and received by the network device, wherein the receive power value of the second terminal is a power value of a signal that is sent by the first terminal on the first communication link and that is received by the second terminal; or: the power control information is determined by the second terminal based on a receive power value of a network device sent by the network device and received by the second terminal, wherein the receive power value of the network device is a power value of a signal that is sent by the first terminal on the first communication link and that is received by the network device. the power control information is determined by a network device based on a receive power value of the second terminal sent by the second terminal and received by the network device, wherein the receive power value of the second terminal is a power value of a signal that is sent by the first terminal on the first communication link and that is received by the second terminal; or: the power control information is determined by the second terminal based on a receive power value of a network device sent by the network device and received by the second terminal, wherein the receive power value of the network device is a power value of a signal that is sent by the first terminal on the first communication link and that is received by the network device.