The invention discloses a mechanism for making a non-woven mesh composite non-woven fabric with a rotary weft laying method. The mechanism comprises two rotary screw rods (1), a warp dent roller (2) and a squeezing roller (3) of a rotary weft laying machine, wherein the roller surfaces of the warp dent roller (2) and the squeezing roller (3) are attached together, and a pulp region (4) is formed above a contact line; two ends of the pulp region (4) are provided with blocking sheets (11) for preventing glue from flowing out; a rubber basin (5) is arranged above the pulp region (4); a weft pulp basin (7) is arranged below the two rotary screw rods (1); a lower weft sizing roller (8) and an upper weft sizing roller (9) are in contact with each other; the upper side edge of the roller surface of the upper weft sizing roller (9) is in contact with weft yarns wound on the two rotary screw rods (1). The mechanism is reasonable in structure; weft yarns and warp yarns are sized respectively, so that the problem of non-uniform arrangement of yarns in original simultaneous sizing of the weft yarns and the warp yarns is solved, the condition of a product is better, and the production efficiency is greatly increased.