A CB resource feedback method is disclosed. The method includes: receiving, by a network device, uplink information that is sent by a sending device on a CB resource; when the uplink information is decoded, feeding back, by the network device correct reception of the uplink information to the sending device through a first physical downlink control channel, where the first physical downlink control channel is masked with an identifier of the sending device. Through the technical solutions provided in embodiments of the present invention, the sending device may be enabled to accurately know that the uplink information sent by the sending device is received correctly or is received incorrectly, and the sending device may be enabled to know a receiving status more quickly.