A method and a device for determining time-frequency resources comprise: a first communication node determining at least one piece of the following information about a first resource set: time-frequency resources of a second resource set contained in the first resource set, configuration information of the second resource set, time-frequency resource configuration information of the first resource set, and a dynamic signaling indication used for indicating whether the first resource set is multiplexed to a PDSCH transmission or a PUSCH transmission or whether the PDSCH transmission or the PUSCH transmission needs to implement rate matching; and transmitting the information to a second communication node. Therefore, the problem in the related art of how to indicate the time-frequency resources used in the PDSCH transmission or the PUSCH transmission is solved, and the time-frequency resources used in the PDSCH transmission or the PUSCH transmission are indicated to a user.