Protective device for animal articular cavity injection

A protective device for animal articular cavity injection comprises an injector body and a fixing platform; a sharp-end needle is arranged on the injector body, a flat-end needle capable of moving on the sharp-end needle to prevent the sharp-end needle from damaging cartilage is clamped outside the sharp-end needle, and the animal articular cavity cannot be damaged through the flat-end needle, and the sharp-end needle can be wrapped in the flat-end needle, so that artificial traumatic osteoarthritis caused by the fact that the sharp-end needle scratches the articular cavity is prevented; and a first sleeve for fixing thighs of an animal is hinged to the fixing platform, a second sleeve for fixing shanks of the animal is hinged to the first sleeve, and clamping teeth for fixing the second sleeve are formed on the fixing platform. According to the device, the included angle between the thighs and the shanks of the animal can be adjusted according to the requirements of an experimenter, the joint cavity gap of t