Direct-current resistance measuring instrument

The invention discloses a direct-current resistance measuring instrument, which is applied to a secondary current loop and comprises a box body and a panel, an electronic circuit board is configured in the box body, and the circuit of the electronic circuit board is a current transformer secondary current loop; the panel is fixed to the box body, and the panel is provided with a display module located in the middle, a resistance value monitoring port formed in the left side of the display module and an operation button located below the display module; the resistance value monitoring ports are six test jacks which are respectively connected with each phase of a three-phase current loop to be tested. The current resistance of a three-phase current loop can be measured at the same time through the configured six test jacks, three-phase comparison and judgment can be carried out by measurement personnel, the problems that an existing measurement method is long in measurement time consumption and inaccurate in me