The utility model provides a portable liquefied natural gas sampler, includes the sampling steel bottle, its structural feature is: the gas outlet of sampling steel bottle is connected with manual valve no. 2, the income gas port of sampling steel bottle links to each other with the homogeneity buffer system through manual valve no. 1, the concrete constitution of homogeneity buffer system is: the export quick -operation joint's of homogeneity buffer system one end links to each other with manual valve no. 1, and the other end links to each other with the first joint of three -way through manual valve no. 3, three -way second articulate has the relief valve, and the three -way third connects to be connected with the gas outlet of homogeneity buffer tank through one -way stop valve, the income gas port of homogeneity buffer tank then loops through electric heat air -vent valve, filter, manual valve no. 4 and links to each other with being used for the entry quick -operation joint who is connected the liquefied natural gas pipeline, income gas port and the electric heat air -vent valve of homogeneity buffer tank between still concatenated thermometer and manometer. This sampler can accurate collection with the unanimous sample of component ratio of being surveyed the liquified natural gas, safe and reliable, the transportation of being convenient for.