This application provides a method for repeatedly transmitting data and a device. The method includes: separately sending, by a terminal device, one piece of data in a PDCP entity to N logical channels, where a direct link transmission manner is used on at least one of the N logical channels, and N is a positive integer greater than or equal to 2; obtaining, by the terminal device, a resource; and sending, by the terminal device, the data on the N logical channels by using the obtained resource.