Weaving method of full-forming trouser crotch narrowing structure and trousers

The invention relates to a knitting method of a full-forming trouser crotch narrowing structure and trousers, a flat knitting machine provided with more than one pair of front and back needle beds which extend along the left-right direction and are opposite to each other in the front-back direction is used, if the total width of the narrowing structure is N needles, the middle four needles are narrowing positions, and N is an even number, the following knitting is carried out, knitting a rear lower needle bed needle position coil on the right side by the yarn nozzle; needle digging is carried out at the (N/2-1) th needle position and the (N/2 + 2) th needle position, and coils of needle digging at the (N/2-1) th needle position and the (N/2 + 2) th needle position are turned to the corresponding front upper needle bed; the upper needle bed coil in front of the N/2 + 2 needle position is moved leftwards by two needle positions and turned to the N/2 needle position of the rear lower needle bed, and the upper ne