The utility model relates to an over voltage protector with an alarming function, which comprises an over voltage protection module. The over voltage protector with the alarming function is mainly technically characterized by further comprising an over voltage monitoring module and an alarming module. the over voltage monitoring module and the over voltage protection module are parallelly connected onto a power grid three-phase circuit, and the output end of the voltage monitoring module is connected with the alarming module. According to the over voltage protector with the alarming function, the design is reasonable; the over voltage monitoring module and the alarming module are added on the basis of the prior over voltage protector, the over voltage is monitored in real time via the over voltage monitoring module, and when an over voltage protection action value arrives, the alarming module performs alarming to prompt a working person. The over voltage protection function is realized, the alarming function is also realized, and timeliness of power grid over voltage protection can be improved.