A method for determining a sidelink resource and a device are provided. The method includes: determining, based on at least one of preset information and a preset parameter, a target sidelink SL resource for a target SL service from candidate SL resources; where the preset information includes either of related information of a resource used by a Uu interface of the terminal device and an attribute of a carrier carrying the target SL resource; and the preset parameter includes at least one of a utilization rate of the candidate SL resources and a communication quality parameter of the candidate SL resources.