Relay cabinet detector for airplane

The invention discloses a relay cabinet detector for an airplane. The relay cabinet detector for the airplane comprises an instrument box, a power supply relay cabinet connector, a detection circuit and a circuit switch, wherein the power supply relay cabinet connector is arranged on the instrument box, the detection circuit is installed in the instrument box, and the circuit switch is installed on the instrument box. The detection circuit comprises a rectification filter unit, a precision voltage stabilization unit, a voltage division adjusting unit, a given unit, an operational amplifying unit, a sampling comparison unit and a fault display unit. According to the relay cabinet detector for the airplane, working conditions of relays in a relay cabinet can be judged precisely and conveniently, the time of detection for the power supply relay cabinet is greatly shortened, damaged relays are replaced, maintenance time is reduced, no professional maintenance personnel are needed, and existing technical problems