The invention relates to an asymmetric fluid pipeline assembly which comprises a main flow pipe (1) and a mixer (2). The main flow pipe (1) comprises a main flow inlet end (3) and a main flow outlet end (4); a mixer inlet (5) is formed in one end of the mixer (2); a mixer outlet is formed in the other end of the mixer (2) and is located in an inner cavity of the main flow pipe (1); a mixer mixinginlet (6) for communicating the inner cavity of the main flow pipe (1) and an inner cavity of the mixer (2) is formed in a pipe wall of the mixer (2); the mixer mixing inlet (6) faces the main flow inlet end (3); two mixer side outlets are symmetrically arranged on two sides of the mixer mixing inlet (6) on the pipe wall of the outlet end of the mixer (2); the main flow pipe (1) is of a variable pipe diameter structure; the main flow inlet end (3) and a main flow outlet end (4) on two ends of the main flow pipe (1) are of circular structures, and the middle section of the main flow pipe (1) isof an oval structure. The air intake resistance is reduced, the air intake loss is reduced, the inflation efficiency is improved, and the engine economy is improved.