The invention relates to an experimental device and an experimental method for determining a slow release rate of a slow release tracer agent. The experimental device comprises a liquid feeding system, a visible tracker agent slow-release chamber, a constant temperature system and a liquid collecting device; the liquid feeding system comprises a liquid storage tank, a height-adjustable liquid storage tank bracket and a liquid running pipeline; the visible tracker agent slow-release chamber comprises an outer shell, an inlet end and an outlet end; the slow release tracer agent can be placed into the visible tracker agent slow-release chamber; the visible tracker agent slow-release chamber can be placed into the constant temperature system; the constant temperature system can be used for supplying constant temperature; the liquid collecting device comprises a sample collecting bottle and an electronic scale. The experimental device according to the invention is capable of providing a stable liquid flow rate in the manner of gravity, is used for replacing the experimental facilities with complex equipment, high experimental cost, easiness in interrupting experiment and harsh experimental environmental requirements, has the characteristics of perfect function, high stability, easiness in operation and low cost, and can meet the experimental requirements related to the determinationfor the slow release rate of the slow release type tracer agent.