Double-flat-wall sandwich glass fiber reinforced plastic pipeline and manufacturing process thereof

The double-flat-wall sandwich glass fiber reinforced plastic pipeline comprises an inner solid wall layer, a sandwich layer and an outer solid wall layer from inside to outside, and the sandwich layer is formed by winding a small-caliber pipeline between the inner solid wall layer and the outer solid wall layer around the axis; and adjacent rings of the small-caliber pipeline are tightly attached. The invention further discloses a manufacturing process of the double-flat-wall sandwich glass fiber reinforced plastic pipeline. The manufacturing process comprises the following steps: (1) winding fiber resin on a continuous winding mold to form the inner solid wall layer; (2) winding a small-caliber pipeline around the axis outside the inner solid wall layer to form a sandwich layer; the rings of the small-caliber pipeline are tightly attached to each other; (3) winding fiber resin outside the sandwich layer to form an outer solid wall layer; (4) curing; and (5) the pipeline is cut according to the required lengt