The invention relates to a multi-functional liquid filling system, and is suitable for places where liquid materials need to be accurately filled. The multi-functional liquid filling system comprises a liquid pipeline system and a computer control system. The multi-functional liquid filling system is characterized in that the liquid pipeline system comprises a liquid storing tank, a standby liquid storing tank, a storing tank of a liquid transporting vehicle, a pump body, a filling device, a filling measurement pipeline, a liquid supplement measurement pipeline and a liquid drainage measurement pipeline. The multi-functional liquid filling system disclosed by the invention integrates a function of accurately filling of liquid, a function of self liquid supplement measurement of the liquid storing tank, and a function of self liquid drainage measurement of the liquid transporting vehicle.