A method for transmitting a power saving signal, comprising: sending, by a network device, a power saving signal to a terminal device, wherein the power saving signal comprises a first sequence, the first sequence is used to indicate at least part of identification information related to the terminal device, and/or the first sequence is used for the terminal device to perform time-frequency synchronization; wherein the identification information related to the terminal device comprises: an identity of a device group which the terminal device belongs to, a device identity of the terminal device, and Physical Cell Identification information of a cell where the terminal device resides; wherein the power saving signal further comprises a first channel, and the first channel is used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device; wherein the power saving signal further comprises a second sequence, and the second sequence is used to indicate at least part of identification information related to the terminal device; wherein: when the first sequence and/or the first channel are not used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device, the second sequence is used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device; when the first sequence is not used to indicate the PCI information of the cell where the terminal device resides, the second sequence is used to indicate the PCI information of the cell where the terminal device resides; and when the first sequence is used to indicate a part of the PCI information of the cell where the terminal device resides, the second sequence is used to indicate the remaining part of the PCI information of the cell where the terminal device resides. sending, by a network device, a power saving signal to a terminal device, wherein the power saving signal comprises a first sequence, the first sequence is used to indicate at least part of identification information related to the terminal device, and/or the first sequence is used for the terminal device to perform time-frequency synchronization; wherein the identification information related to the terminal device comprises: an identity of a device group which the terminal device belongs to, a device identity of the terminal device, and Physical Cell Identification information of a cell where the terminal device resides; wherein the power saving signal further comprises a first channel, and the first channel is used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device; wherein the power saving signal further comprises a second sequence, and the second sequence is used to indicate at least part of identification information related to the terminal device; wherein: when the first sequence and/or the first channel are not used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device, the second sequence is used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device; when the first sequence is not used to indicate the PCI information of the cell where the terminal device resides, the second sequence is used to indicate the PCI information of the cell where the terminal device resides; and when the first sequence is used to indicate a part of the PCI information of the cell where the terminal device resides, the second sequence is used to indicate the remaining part of the PCI information of the cell where the terminal device resides. when the first sequence and/or the first channel are not used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device, the second sequence is used to indicate the identity of the device group which the terminal device belongs to or the device identity of the terminal device; when the first sequence is not used to indicate the PCI information of the cell where the terminal device resides, the second sequence is used to indicate the PCI information of the cell where the terminal device resides; and when the first sequence is used to indicate a part of the PCI information of the cell where the terminal device resides, the second sequence is used to indicate the remaining part of the PCI information of the cell where the terminal device resides.