Fixing tool for machining plastic inner container of hydrogen cylinder

The utility model discloses a fixing tool for processing a plastic inner container of a hydrogen cylinder. The fixing tool is characterized by comprising an annular fixing body and a bottleneck fixing hole, a sealing ring groove, a vacuum groove and a vacuum valve hole are formed in the front surface of the annular fixing body; the sealing ring groove comprises an inner sealing ring groove arranged on one side close to the bottleneck fixing hole and an outer sealing ring groove arranged on one side close to the outer diameter of the circular ring; sealing rings are respectively arranged on the inner sealing ring groove and the outer sealing ring groove; the vacuum groove is formed between the inner sealing ring groove and the outer sealing ring groove; bolt holes are formed in the back surface of the circular ring-shaped fixing body; and the vacuum valve is arranged between the inner sealing ring groove and the outer sealing ring groove. According to the tool, the plastic inner container is stably fixed on pr