The machine is an auto-liquid filling device that is composed of PLC, a human-computer interface, an optoelectronic sensor, and air-powered. Combined with filling, plugging, capping, and screwing in one unit. It has the advantages of high accuracy, stable performance, and greater versatility under extreme operating conditions which enjoys high prestige. It has been widely applied in areas of the pharmaceuticals industry, especially suitable for liquid filling and capping as well as other small volume bottles.