This application provides an uplink transmission time domain resource determining method and an apparatus. The uplink transmission time domain resource determining method in this application includes: receiving first information sent by a network device, where the first information is used to configure a time domain resource of a physical uplink shared channel PUSCH occasion, and the first information includes guard period configuration information and time domain resource configuration information of the PUSCH occasion; and determining time domain resources of a plurality of first PUSCH occasions based on the first information, where all time domain symbols of each first PUSCH occasion are in a same slot, and a time domain interval between at least two adjacent first PUSCH occasions in the plurality of first PUSCH occasions is greater than or equal to a guard period configured based on the guard period configuration information.