The invention discloses equipment for dynamically simulating and testing the biodegradability of a medical magnesium alloy in vitro. The equipment comprises a thermostatic bath, a liquid storage tank, a circulating pump, a flow meter, a test chamber, an upper-level sample loader, a pipette and a backflow tube, wherein the pipette and the backflow tube are arranged in the liquid storage tank respectively; the liquid storage tank is arranged in the thermostatic bath; the flow meter and the test chamber are vertically fixed respectively; the upper sample loader is hung in the test chamber by a chamber top cover of the test chamber; and the pipette is connected with an inlet of the circulating pump, an outlet of the circulating pump is connected with the inlet of the flow meter, the outlet ofthe flow meter is connected with an inlet tube of the test chamber, and an outlet tube of the test chamber is connected with the backflow tube by matched water pipes respectively to form a liquid medium circulation path. The equipment has the advantages of compact structure, convenience of use, high university and the like. By the equipment, the influence of medium flow rate, components, temperature, pH value and the like on medium corrodibility and material degradability can be quickly and accurately tested and evaluated, the research and development efficiency and quality can be obviously improved, and the research and development cost can be obviously reduced.