The utility model discloses a be applied to capacitance level gauge of marine LNG basin, it includes: sensor (probe), be fixed in the basin inside, provide a change capacitance value that is directly proportional with the liquid level height, withstand voltage electrode extracting device: with the data line from the basin is inside guide to the jar outside, the changer: does the capacitance value of surveying the sensor convert 4 into 20mA's electric output signal, the data line: signal transmission, the display list: a number of degrees directly perceived of tank inside temperature and liquid level is provided, pass through vacuum sandwich structure: draw forth in following basin vacuum intermediate layer with the data line, these how many major parts constitute this capacitance level gauge who is applied to the LNG basin, its reliability is high, longe -lived, stability is high, the structure is exquisite, environmental suitability is strong, simple to operate.