The present disclosure provides a method and a device for sidelink communication. One example method includes: a terminal device receives a first PSSCH; the terminal device performs channel access on the shared spectrum, where the first PSSCH is associated with a plurality of PSFCH transmission resources on the shared spectrum, and the plurality of PSFCH transmission resources are located on at least one of reserved resources or dynamic resources on the shared spectrum; the terminal device transmits a first PSFCH using one PSFCH transmission resource of the plurality of PSFCH transmission resources, where the first PSFCH carries feedback information associated with the first PSSCH.