Helicopter undercarriage system tester

The invention belongs to the technical field of helicopter testing, and proposes a helicopter undercarriage system tester. The tester comprises an A-J1 module which enables input power to be converted into 220V/50Hz alternating current and transmits the 220V/50Hz alternating current to a rectification converter; the rectification converter which enables the 220V/50Hz alternating current to be converted into 28V DC power needed by an undercarriage system for work; a single-pole double-throw switch, wherein the first tap position of the single-pole double-throw switch is connected to a positive end A point of a 26GA1 module, and the third tap position of the single-pole double-throw switch is connected to the positive end A point of a 26GA2 module; the 26GA1 module which is connected with a helicopter undercarriage folding control unit and transmits an exciting electric signal to the helicopter undercarriage folding control unit; and a 26GA2 module which is connected with a helicopter undercarriage putting control unit and transmits an exciting electric signal to the helicopter undercarriage putting control unit.