The utility model discloses a substation fault tripping sound and light alarm device which comprises a power supply module, a control circuit module, a signal acquisition module, an LED display module, an alarm module and a heat radiating module. The device is characterized in that the signal acquisition module is provided with a signal receiving end, a current limiting resistor and a photoelectric coupler. The device has the advantages that a tripping signal flows through the photoelectric coupler via the current limiting resistor, the triode conducting potential of the photoelectric coupler is changed, a main control device acquires the change of the signal, words 'tripping fault' are displayed through the LED display module, an alarm is triggered through the alarm module to emit an alarm, the staff is reminded to pay attention, and thus the staff can carry out reset and alarm pause operations on equipment through a man-machine interface device. Even the working position of maintenance is far from the main control room, the field staff can effectively obtain an alarm signal, prompt information is timely and effectively issued, and the working efficiency of the staff is improved.