The invention discloses a rearing cage for unified injection of experimental mice. The rearing cage comprises a machine shell, wherein a driving cavity is formed in the upper portion of the machine shell, a driving mechanism is arranged in the driving cavity, an injection action cavity with an opening in the right cavity wall is formed in the middle of the machine shell, an injection action block groove communicating with the injection action cavity is formed in the injection action cavity, an injection action block is connected to the interior of the injection action block groove in a sliding mode, and an injection mechanism is arranged in the injection action block. The cage is simple in structure and convenient and fast to operate, when the cage works, an injector for injection can be placed in the cage, then the cage is started, the cage can attract laboratory mice by means of food, the laboratory mice are trapped in the container with the size fixed, then a needle sinks by 45 degrees to inject one mouse, a needle carrier is moved to the next position, the needle is replaced in the process, then the next mouse is injected, and therefore, the cage has the beneficial effects of being convenient, fast and effective.