Isolation protection circuit for realizing multi-machine communication serial port

The utility model belongs to the technical field of communication, and particularly relates to an isolation protection circuit of a multi-machine communication serial port. An isolation protection circuit for realizing a multi-machine communication serial port comprises a host end and a slave end, a serial port sending end of the host end is sequentially connected with a main sending optocoupler and a main sending triode, and a serial port receiving end of the host end is connected with a main receiving triode; the serial port sending end of the slave end is connected with the slave sending optocoupler, and the serial port receiving end of the slave end is connected with the slave receiving optocoupler; the host end is connected with a slave receiving optocoupler of the slave end through amaster sending triode; and the slave end is connected with the master receiving triode of the host end through the slave sending optocoupler. The isolation protection circuit for realizing the multi-machine communication ser