The present application provides data transmitting and receiving methods in a narrow-band communication system, a two-way radio and a storage medium. The general idea of the present application is as follows: the two-way radio at the transmitting end firstly transmits a pilot signal, which activates the two-way radio at the receiving end into an operating state; the two-way radio at the transmitting end, after transmitting the pilot signal, transmits data to be transmitted to the two-way radio at the receiving end; the two-way radio at the receiving end, according to the pilot signal, switches the two-way radio at the receiving end into the operating state, and in its operating state receives data transmitted by the two-way radio at the transmitting end. This ensures that the two-way radio at the receiving end may receive data from the two-way radio at the transmitting end in real time, thereby improving the accuracy of data transmitted by the two-way radio at the transmitting end.