A telecontrol channel fault monitoring device comprises a controller. A host and a GSM module are disposed in the controller. The host includes a power module, a CPU board, a communication interface board, and an LCD control panel. The controller is installed inside a transparent shell. A display screen is arranged on the controller and is connected to the LCD control panel. According to equipment configuration situations of current transformer station telecontrol systems, installation and a wiring method of the device is designed, so that the device can fit with various actual situations in the field with good adaptability. After faults and hidden troubles are found, clear warnings are displayed on the screen on the front panel of the device, explicitly indicating detailed information such as a warning node, an address, time of happening, etc. Meanwhile, workers are informed about the warnings in the form of short messages.