The invention provides a relay protection alarm device. The relay protection alarm device comprises a three-phase voltage alarm, plugs and a plurality of split-phase current alarms, wherein the three-phase voltage alarm includes 3 voltage alarm test lines and one zero line; the color of the voltage alarm test lines and the color of the zero line are respectively corresponding to the colors of a four-core relay protection test line one-to-one; the end parts of the voltage alarm test lines are provided with the plugs which are used for plugging the tail part of a plug of a four-core relay protection test line; the top end of each plug is provided with a contact pin; a light emitting diode and a back diode are connected in the plug in series; the lamp head of the light emitting diode is arranged in the way that the lamp head is exposed to the outside of the plug; a protection resistor is also arranged between the light emitting diode and the back diode for protecting circuits; a light emitting diode and a back diode are arranged in each split-phase current alarm; and the lamp head of the light emitting diode is arranged in the way that the lamp head is exposed to the outside of the current alarm.