The embodiment of the invention provides an air conditioner wiring detection device, a test system and a detection method. According to the invention, a detection wiring terminal, a zero line terminal, a live line terminal, a detection module and a detection result prompting module are arranged; a control loop of the detection module is bridged between the detection wiring terminal and the zero line terminal; a controlled loop of the detection module is bridged between the zero line terminal and the detection result prompting module; the detection result prompting module is further connected to the live wire terminal; when the detection wiring terminal receives that the detection output from an air conditioner indoor unit is normal, the control loop of the detection module drives the controlled loop, and the detection result prompting module prompts that the output is normal; when the detection wiring terminal receives abnormal detection output from the air conditioner indoor unit, thecontrol loop of the detection module does not drive the controlled loop, so that the detection result prompting module prompts that the output is abnormal; through the arrangement, the problems of misjudgment or missing detection are effectively avoided, the working intensity is reduced, and the working efficiency and safety are improved.