The utility model discloses a voltage detector belongs to power electronic test equipment technology field for the trade, voltage detector, and the key is: voltage detector still include a set of circuit, every circuit all be including the series connection at pilot lamp and relay between the battery both ends, all circuit are parallelly connected, and set up and all relays all are connected withthe controller. It is big more to be surveyed voltage, and the relay that is communicate is more, and the pilot lamp of being lighted is just also more, just so can the remote quantity of being lighted through the pilot lamp determines out the general scope of the voltage of surveying, convenience more directly perceived.