The utility model discloses an insulating open close performance of oil instrument detects box, including 31 last core terminal boxes and 31 lower core sockets, be equipped with 31 parallel connection's connector lug down on the 31 core sockets, district and megohmmeter jack are instructed to the 31 last core plugs, the fluorescent tube that are equipped with detection circuitry in the 31 last core terminal boxes respectively, connect on detection circuitry, on instructing and distinguish, the fluorescent tube is equipped with 31 pilot lamps and the switch of shifting. This measuring box uses the break -make performance of once only checking all wiring of instrument from electrified source. Can also once only detect insulating properties between all wiring and the shell to instruments such as three parameter instruments, flexible nipple joint, rotatory nipple joint, eccentric sub, insulating nipple joints.