The invention discloses a handheld permanent magnetic switch coil operating loop detector. The handheld permanent magnetic switch coil operating loop detector includes an indication light LED1, a diode D1, a current-limiting resistor R1, an operating power source interface and an operating coil interface; the positive pole of the operating power source interface is connected with the current limiting resistor R1 and then is connected with the indication light LED1; the indication light LED1 is connecting with the positive pole of the diode D1; the negative pole of the diode D1 is connected with the operating coil interface; the negative pole of the operating power source interface is connected with the operating coil interface; and detection current in the detector is smaller than 10mA. The handheld permanent magnetic switch coil operating loop detector of the invention has the advantages of simplicity, easiness in use, no need for cooperation of external power outage, no need for independent power supply, no complicated software support and high engineering practicability. With the handheld permanent magnetic switch coil operating loop detector adopted, whether a permanent magnetic switch coil operating loop is normal or not can be detected by using the operating power source of the operating loop itself when the power supply of an external line is normal, and therefore, a large quantity of manpower is not needed to be wasted, and production efficiency is not affected, and the problems of influence on production, time-consuming and labor-consuming properties of an existing permanent magnetic switch maintenance method can be solved.