LNG refueling device for wharf boat

The utility model discloses an LNG refueling device for a wharf boat, and relates to the field of liquefied gas refueling. The device comprises an LNG storage tank, a refueling control cabinet and a low-temperature refueling arm, wherein the LNG storage tank is connected with the low-temperature refueling arm via the refueling control cabinet; the low-temperature refueling arm comprises a vertical column of a hollow structure and a horizontal balanced device arranged at the outer side of the vertical column; a nitrogen input valve and a dangerous gas output valve are arranged at the outer side of the vertical column; the vertical column is internally provided with a liquefied gas detection device which is respectively connected with the nitrogen input valve and the dangerous gas output valve electrically; the nitrogen input valve penetrates through the vertical column via a nitrogen pipeline; and the nitrogen pipeline is connected with the inner side wall of the vertical column. The LNG refueling device not only is relatively safe, but also can effectively reduce the labor intensity of workers.