The utility model relates to a device for querying the loop resistance allowable value of a breaker. The device comprises a storage module, a display module and a query input module, wherein the storage module is used for storing equipment information of different switch equipment; the equipment information at least comprises a switch type, rated voltage, rated current, a manufacturer, the resistance allowable value and an installation site; the display module is connected with the storage module and used for displaying the equipment information of the different switch equipment; and the query input module is connected with the storage module and used for inputting an instruction to allow the equipment information stored by the storage module to be displayed by the display module. By storing the equipment information of the different switch equipment in a centralized mode, timely query and judgment can be performed in a field test, contents are comprehensive, data are accurate, a large amount of analysis time is saved, and data misjudgment is avoided.