The invention discloses an isolating coupler, comprising a microprocessor module, a first data signal processing module, a second data signal processing module and an isolating module which are connected in a communication manner. Signal output ends of the microprocessor module are respectively electrically connected with signal input ends of a JTAG (joint test action group) interface module and a display module, and input ends of the microprocessor module are respectively electrically connected with signal output ends of a clock module, a resetting module and a voltage stabilizing module; the first data signal processing module and the second data signal processing module are respectively connected with a first power signal interface module in a communication manner, and a signal output end of the first power signal interface module is respectively electrically connected with signal input ends of the first data signal processing module, the second data signal processing module and the voltage stabilizing module via a first power module; and the isolating module is connected with a second power signal interface module via a third data signal processing module and a fourth data signal processing module respectively in a communication manner. The isolating coupler has the advantage that reliability of the isolating coupler is greatly improved.