The invention provides a rod cluster channel flow visualization experiment system. The experiment system comprises four parts: a water loop, a tracer branch, a rod beam channel and a data collection system. The main devices in the water loop comprise a circulating water tank, a centrifugal pump, a flowmeter, a thermometer and a pressure gage. The tracer branch mainly comprises a tracer storage box, an injection pump, an adjusting valve and a tracer injection syringe needle. The rod beam channel mainly comprises a channel body, a visual rod beam, a positioning screen work and an exhaust valve. The data collection system mainly comprises a computer, a data collection plate and a camera. The system is simple and compact, the price is low, visual observation is convenient, and the research condition scope is wide.