Snap ring type pipeline joint thread anti-loosening structure

The utility model provides a snap ring type pipeline joint thread anti-loosening structure which comprises a flat pipe nozzle, a jacket nut, a snap ring, a straight joint and a device body. After the outer sleeve nut and the straight-through are assembled, the outer edges of the clamping grooves of the outer sleeve nut and the straight-through possibly make contact with each other or a gap is reserved, the clamping grooves of the straight-through and the outer sleeve nut are provided with arc-shaped clamping rings, and the U-shaped edges of the clamping rings are embedded into the clamping grooves of the outer sleeve nut and the clamping grooves of the straight-through respectively. In order to ensure that the clamping ring does not fall off, the design and the material of the flat nozzle are consistent with those of a traditional flat nozzle. The outer sleeve nut and the straight-through clamping groove can be manufactured through turning. The flat nozzle opening, the clamping ring and the straight-through p