Liquefied natural gas loading sledge

The utility model belongs to the technical field of liquefied natural gas transportation, and discloses a liquefied natural gas loading skid. The liquefied natural gas loading skid comprises a filling passage, a gas return passage, an emptying passage and a shielding gas purging passage, the shielding gas purging passage comprises a first connecting passage, a second connecting passage and a third connecting passage, the first connecting passage is communicated with the filling passage and can purge shielding gas for the filling passage, and the second connecting passage is communicated with the gas return passage and can purge the shielding gas for the filling passage. And the third connecting passage is communicated with the air returning passage and can supply a driving air source to the air tool. According to the pneumatic tool, an operator can dismount bolts and nuts on a tank car flange on a transport vehicle through the pneumatic tool, the dismounting efficiency can be improved, the connecting and fast