The invention discloses a line inspection mark auxiliary device comprising a current monitoring system and an inspection module, wherein the inspection module comprises a transmitting end external component and a reply terminal external component; the current monitoring system A sends the monitored user information that may be transferred to the power supply to the administrator's mobile phone through a network cloud platform or a power terminal for real-time alarm prompt through the GPRS wireless network communication technology or the RS-485 signal line; the transmitting end external component and the reply terminal external component are connected to the computer through data lines, and the coding of the transmitting end external component and the reply terminal external component is modified by the upper computer software of the computer. The line inspection mark auxiliary device has the advantages of high efficiency, practicality, convenience, quick resolution of the line direction, maximum assurance of security of power consumption and company benefits, small size, and intuitive, fast, simple and effective determination of the line direction to determine the electricity priceof the line, and can make the inspection personnel work more convenient, intuitive and accurate in the inspection.