This application provides a communication transmission method and a device. The method includes: A terminal device receives first indication information from a network device; and the terminal device skips PDCCH monitoring in a first cell based on the first indication information. The first cell is a single cell; the first cell is a primary cell Pcell; the first cell is a Pcell and at least one Scell of secondary cells Scells in which PDCCH monitoring is skipped when PDCCH monitoring is skipped in the Pcell; or the first cell is a Pcell and all activated Scells of Scells. The method effectively avoids PDCCH-only of the terminal device in the first cell, and better reduces power consumption. In addition, when the first cell includes both the Pcell and the Scell, a mechanism of simultaneously skipping PDCCH monitoring in both the Pcell and the Scell can be implemented. This further effectively reduces power consumption of the terminal device and reduces signaling transmission.