Fault detector of excavator

The invention discloses a fault detector of an excavator. The fault detector of the excavator comprises a detection wiring harness, an electric device drive module, a meter control panel and a power line. The electric device drive module is used for driving to-be-detected electric devices in an air conditioner system, an electronic throttle control system and a flameout system for simulated working state demonstration. The meter control panel comprises an electric device working state demonstration control button, an electric device working state indicator lamp and a display module, wherein the electric device working state demonstration control button is used for controlling the electric device drive module to achieve simulation demonstration of the working state of the to-be-detected electric devices; the electric device working state indicator lamp is used for displaying the working state of the to-be-detected electric devices; the display module is used for displaying related data information and/or related data information change situations of the to-be-detected electric devices in the air conditioner system, the electronic throttle control system and the flameout system under the simulated working state. The fault detector of the excavator can rapidly and accurately detect electric devices which cannot be easily detected or are large in detection difficulty in the maintenance process of the excavator and remove faults, and operation is visual, easy and convenient.