Tank container has many advantages: little investment, large in capacity, safe and environmental in storage and transportation, low cost in transport. It is a perfect special equipment for transportation suitable for combined transportation of waterway, highway and railway for chemical goods in liquid and gas. High purity ammonia tank container is manufactured by buffing machine which holds exclusive intellectual property rights and inner surface treatment technology which has obtained the country patent of invent. There are great innovation in joint structure in valve seat flange, tanker body and frame. The inner surface roughness is not more than 0.2μm. This meets the requirements that the tank container can fill high purity industrial gas whose purity is not less than 99.999995%(7.5N). Tank container has obtained 2 country patent of invents and 9 utility model patents. Related technologies are at the international advanced level.