The utility model relates to a power line parameter detection auxiliary system based on the Internet of Things. The utility model discloses a line parameter testing auxiliary device, belongs to the field of electrical parameter detection of a strong current system, and aims to provide a brand-new line parameter testing auxiliary device to solve the problem of frequent tower climbing and wiring operation of an operator in the line parameter testing process so as to ensure the personal safety to the maximum extent. According to the adopted scheme, the system comprises a matching end control device, a test end control device, a parameter tester device, an intelligent terminal and a power line group, the power line group is a three-phase line and comprises a first phase line, a second phase line, a third phase line and a ground line; the matching end control device comprises a first processor, a first power supply module, a first display module, a first GSM module and a first control switch group; the utility model is suitable for power line parameter detection.