Extremely low jitter and accumulated jitter-free digital transmission method of time code

The invention relates to the technical field of optical communication, in particular to an extremely low jitter and accumulated jitter-free digital transmission method for time codes, which is characterized in that a reference clock of front-end transmission equipment is provided from a satellite signal receiver, so that a processing clock of the front-end transmission equipment and a clock of the satellite signal receiver are homologous and are in the same clock domain. When the transmission devices need to be cascaded, the processed clock domains are also the same. Meanwhile, the rising edge of the time code is automatically identified, corresponding sampling time is generated, uncertain signal points such as rising/falling edges are prevented from being just sampled during sampling, and sampling jitter is avoided. The rising edge of the time code is automatically identified, and the time code is accurately acquired, so that jitter accumulation of the time code in the transmission process is avoided, the ji