Flow dip dyeing apparatus

The utility model relates to a flow dip dyeing apparatus, which comprises a trace dyeing tank, a liquid injection pipe, a liquid discharging pipe, a peristaltic pump, an optical sensing device and a main control module, wherein the trace dyeing tank is used for storing a dyeing liquid and a single slide loaded with a sample and is provided with a liquid injection hole and a liquid discharging hole; the liquid injection pipe is connected to the liquid injection hole and a dyeing liquid container or a flushing liquid container; the liquid discharging pipe is connected to the liquid discharging hole and the exterior of the dyeing apparatus; the peristaltic pump is arranged on the liquid injection pipe; the control end of the peristaltic pump is connected to the main control module; the optical sensing device is arranged on the side surface of the trace dyeing tank and used for detecting the thickness of the sample loaded on the slide and supplying a detection signal to the main control module; and the main contr