Abstract: The paper introduced some new kinds of measuring instruments for liquid-level used in industry production process and their measuring methods,such as fiber liquid-level meter,magnetostriction liquid-level meter,fork liquid-level limit switch,differential pressure type liquid-level meter,radar liquid-level meter and servo type float liquid-level meter,and analyzed and compared the characteristics of the several liquid-level meters.At last,it indicated that automatic measuring technology for liquid-level on the one hand must use new measuring principle,develop new measuring instruments for liquid-level and expand measuring way,on the other hand,it must develop facing on micro-computerization and intelligence.