The invention discloses a multi-segment splicing technology for connecting different-line-width ink-jet printing lines. The line width of a printing line achieving a connecting effect on printing between the small-line-width printing line and the large-line-width printing line meets the following conditions that (1) the line width is larger than or equal to the smallest line width of the printingline during connection with the large-line-width printing line without a corner ink accumulation phenomenon; and (2) the line width is close to the line width of the small-line-width printing line. Through the multi-segment splicing technology, the problems that in complex pattern design, when different-line-width ink-jet printing lines are connected, fluid flows from the small-line-width printingline to the large-line-width printing line is mainly solved, the corner ink accumulation phenomenon during printing line connection can be improved effectively by adding a small middle segment between the small-line-width printing line and the large-line-width printing line, the multi-segment splicing technology is a supplement to a regulation and control method for pattern precision and solute distribution during ink-jet printing of a complex pattern, and the multi-segment splicing technology is simple and easy to operate.