The utility model discloses an experimental animal fixing device for getting blood. The experimental animal fixing device for getting the blood comprises a body (1) and a cover body (2). The body (1) and the cover body (2) are cylinder-shaped and can be connected. The center of the bottom of the body (1) is provided with a ventilating hole (5). The center of the top of the cover body (2) is provided with a tail outlet hole (6). The upper portion of the body (1) is provided with first adjustment threads (3). The cover body (2) is provided with second adjustment threads (4) matched with the first adjustment threads (3). The body (1) and the cover body (2) are connected through the first adjustment threads (3) and the second adjustment threads (4) in a screwing mode. The experimental animal fixing device for getting the blood can simply and efficiently fix a rat, the tail portion independently exposed outside the device can be freely handled by a laboratory technician, and therefore the experimental animal fixing device for getting the blood brings great convenience to an experimental process. The experimental animal fixing device for getting the blood can be produced into a plurality of specifications according to different body forms of rats, and is wide in application range.