The invention discloses a 1PPS + TOD signal transmission method and system, and relates to the field of time synchronization signal transmission. The method comprises the steps that after a sending end identifies the rising edge of a 1PPS signal, a 1PPS indication signal is generated, and a frame positioning signal is generated after TOD signal receiving is completed; the sending end multiplexes the frame positioning signal, the 1PPS indication signal and the TOD signal on one signal line for transmission; after receiving the frame positioning signal, the receiving end detects the 1PPS indication signal and recovers the 1PPS signal according to the detected 1PPS indication signal; and acquiring a TOD signal after the 1PPS indication signal is detected. According to the invention, the timesynchronization precision of the 1PPS + TOD signal can be improved while the resource occupancy rate of the backboard interconnection line is reduced.