The utility model discloses a synchronous ware of OTN network transmission, including OTN network speed detection circuitry, standard speed modulate circuit, synchronous detection circuitry, the synchronous detection circuitry of circuit connection is taked care of to OTN network speed detection circuitry, standard speed, has effectually solved present OTN network transmission and relies on time dislocation that clock synchronization caused and the problem that influences transmission rate. The utility model discloses think about ingenious, simple structure, adopt optoelectronic coupler real -time detection OTN network transmission's speed and standard speed signal to get into the difference amplifier that operational amplifier is the core, carry out the difference and compare, enlarge tosend into the synchronous correction circuit after voltage follower buffering is kept apart, data transmission's carrier frequency is adjusted at the transmitting terminal to the synchronous correction circuit, and then the speed of adjusting OTN network transmission, has improved transmission rate.