A fully automatic oxygen-controlled animal cabin, belonging to the technical field of medical experiment equipment, which solves the problem of automatic control of low oxygen concentration in the animal cabin and the uniformity of the distribution of mixed gas in the animal cabin; the whole experimental equipment consists of nitrogen cylinders, Air pump, animal cabin, buffer tank, central processing unit, flow meter, distributor, several conduits, cables, etc.; by adjusting the concentration of nitrogen in the animal cabin, the effect of indirectly controlling the oxygen concentration is achieved; the size of the oxygen concentration and The time to maintain the hypoxic environment is automatically controlled by the central processing unit. The equipment is highly automated and does not require special personnel to wait; the use of flow meters, distributors and buffer tanks reduces or even eliminates the damage of small jets of gas to small animals. , has the advantages of uniform and gentle air supply, and eliminates the phenomenon of uneven oxygen concentration distribution in the animal cabin from the source.