Dosing device for externally applied liquid drug

The utility model discloses a dosing device for an externally applied liquid drug and belongs to the technical field of a medical instrument. The dosing device is characterized in that an inclined plate is fixedly connected with one end of a base at a certain degree; an injector of a syringe is connected with a needle through a one-way valve; a drug feeding pipe of the syringe is connected with a drug feeding bottle through the one-way valve; a bottle opening of a dosing bottle is connected with the needle through a fixing frame; one end of a bolt bar passes through a thread hole at the center of the syringe and a through hole at the center of the inclined plate and is in rotating connection with one end of the base; the other end of the bolt bar passes through the other end of the base and is fixedly connected with a rocking handle; the syringe is in threaded connection with the bolt bar; the bolt bar is in threaded connection with two positioning nuts; one end of a piston is fixedly connected with one end o