A method for receiving a power saving signal, a method for transmitting a power saving signal, and a related device are provided. The method includes: in a case that a beam failure is detected, transmitting a random access request; and after the random access request is transmitted and before a transmission control indication TCI state is updated, performing detection for a power saving signal in a recovery search space based on a first quasi co-location QCL relationship, where the first QCL relationship is a QCL relationship of beam failure recovery reference signals BFR-RS.