This application discloses an uplink control information transmission method. A terminal may determine, based on received first DCI, whether UCI triggered by the DCI is highly reliable UCI, and if the UCI is highly reliable UCI, design a special transmission policy for the UCI, to protect the UCI and ensure reliability of a URLLC service. In this application, the special transmission policy may be superior to a common UCI transmission policy in at least one of the following aspects: a transmission resource, a coding scheme, a sending sequence, and the like.