A signal transmission method, a network device, a terminal and a storage medium are provided. The signal transmission method includes transmitting, by a network device, a PEI to a terminal in an idle mode or an inactive mode. The PEI includes at least one of a first power-saving signal or a second power-saving signal, the PEI is used to indicate whether the terminal is to detect paging information on PO, the PEI is transmitted before the PO, and the PO includes at least one PO or at least one PO group.