The work aims to solve the problem of barrel deformation and damage when fixture was working, and the problem that fixture was not compatible with multiple types of barrels. An airbag-type fixture was designed in which the 4-linkage structure was used to ensure that the gripping device remained vertical and the distance of gripping device was adjusted by air cylinder. In this fixture, the fixture space was saved by 4-linkage structure. The adjusted air cylinder ensured that the fixture could be compatible with multiple types of barrels. Furthermore, damage of barrel was avoided with the airbag. The costs of fixture design and manufacture were reduced because of the double-stroke grasping cylinder, which could make the fixture suitable for barrel with taper and flanging. The practical application shows that the fixture operates reliably and has promotional value.