This application provides a carrier frequency tracking method, a signal transmission method, and a related apparatus. The carrier frequency tracking method includes: A terminal device receives a first tracking reference signal from a first transmission reception apparatus of a single frequency network cell; the terminal device receives a second tracking reference signal from a second transmission reception apparatus of the single frequency network cell, where the first tracking reference signal and the second tracking reference signal occupy different time-frequency resources; and the terminal device performs carrier frequency tracking based on at least one of the first tracking reference signal and the second tracking reference signal. In this way, the terminal device can obtain, based on a plurality of received TRSs, one appropriate carrier frequency on which the carrier frequency tracking is to be performed, and perform data transmission on the tracked carrier frequency, to improve data transmission performance of the terminal device. Technical solutions of this application may be applied to a single frequency network scenario, for example, a highspeed railway scenario.