The utility model relates to a lubrication system safety monitor, which comprises an oil pressure sensor and a logic control circuit which is composed of a speed sensor, a speed measuring circuit, an idle speed threshold circuit, a delay turn-off circuit, an or gate circuit and an execution controller which are connected. The executing controller is connected with the igniting coil of an engine, the idle speed threshold circuit outputs conversion signals according to the speed value, and the or gate circuit and the execution controller can judge whether the system of the utility model is normal or not if combined with the level signals output by the oil pressure sensor and makes the engine start or die out.