Liquid preparation injector

The utility model relates to a liquid preparation syringe which comprises an injection tube, a core rod, a needle tube and a needle cap, the injection tube comprises a main body part and an extension part, the main body part is provided with an inner cavity used for containing liquid medicine, and the extension part is connected with the main body part and provided with a channel communicated with the inner cavity. The extending part is provided with a reinforcing rib formed by extending from the joint of the extending part and the main body part in the direction away from the main body part, the core rod is movably arranged in the inner cavity, the needle tube is installed on the extending part, one end of the needle tube is provided with a needle tip, the other end of the needle tube is embedded into the extending part, and the main body part and the needle tube form an injection channel through a channel. The needle cap is detachably arranged on the extending part in a sleeving mode, and the needle cap and