The invention belongs to the technical field of operation monitoring of nuclear power plants, and particularly relates to an overhauling tool of a Hall-type reversing switch instrument. The overhauling tool is designed in an integrated manner, and comprises a magnetic pole detection sensing device, a control panel, a speed regulating motor, magnetic steel, a reverse switch, a relay and an output indication; the control panel comprises a rotating speed controller, an automatic controller, an adjustable power supply and a manual controller; in the control panel, the automatic controller can control the speed regulating motor by controlling the rotating speed controller, and can control the reversing switch by controlling the adjustable power supply; and the manual controller can control therotating speed controller by controlling the rotating speed controller, and can control the reversing switch by controlling the adjustable power supply. The magnetic pole detection sensing device integrated in in the tool can perform magnetic pole identification, verification and polarity judgment on the magnetic steel of the instrument, so as to judge the magnetic properties and polarity of the magnetic steel of the instrument, quickly locate the installation direction of the magnetic steel, and to prevent the wrong installation direction of the magnetic steel onsite from leading to abnormalworking of the instrument.