The invention discloses a lightproof transfusion bag capable of displaying the amount of medicine liquid. The lightproof transfusion bag includes a transfusion bag body and a weighing display device for holding the transfusion bag body; the weighing display device is a rectangular solid box; a hook is arranged on a top end of the weighing display device; a liquid crystal display screen and a buzzer are arranged on a side wall of the weighing display device; a weighing sensor is arranged on the bottom of the weighing display device; the weighing sensor is electrically connected to the liquid crystal display screen and the buzzer; the transfusion bag body is made of a medical grade PVC material; the medical grade PVC material includes, by weight, 58-64 parts of PVC resin, 18-24 parts of dioctyl phthalate, 15-20 parts of polyacrylate, 4-8 parts of nano silica, 2-5 parts of NA, and 9-14 parts of epoxidized soybean oil. The lightproof transfusion bag can display the amount of the medicine liquid in the transfusion bag, has a low liquid level prompting function, and can prevent blood backflow in transfusion.