Airplane alternating current power supply system detection device

The utility model discloses an airplane AC power supply system detection device, comprising an MCU processor, and a display module, an input module and a relay module which are connected with the MCU processor, the relay module is connected with a plurality of test interfaces and an excitation transformer module; the relay module comprises a driving circuit and a plurality of single-pole double-throw relays connected with the driving circuit; and the driver adopts a ULN2803 driving circuit and is connected with an I/O (Input/Output) interface of the singlechip. According to the utility model, a complete set of control circuit, the relay, the mouse, the display screen and the like are designed into a detection instrument to be used as a special detection device for an on-board alternating current power supply, the mouse is used as an output mode of an operator, and the display screen is combined to display each test item and related performance parameters, so that the operation becomes very simple and convenie