Invention problem solving theory (TRIZ) is a systematic methodology system that guides people to innovate and solve engineering problems. The knotter is the core part of the forage picking and baling machine. Its main function is to tie the baling rope of enveloping grass into a solid and reliable knot. Each picking and baling machine is equipped with multiple sets of knotter as required and installed on the main shaft of the knotter together. Knot for picking and baling machine frame body dismantling trouble and difficult to repair and replacement after damage, arising from resulting work stoppage, slowdown productivity fell sharply, and application of the theory of TRIZ innovative methods were analyzed. Through the description of the existing problems, the causality analysis was carried out by using fishbone diagram to find out the cause of the problems and point out the direction for further solving the problems. Through functional analysis, the initial solution of the problem was found out, and then the contradiction analysis method was applied to get the final solution of the problem. By TRIZ theory analysis, the final solution of simple described as knot in the shaft hole of the frame body were inlaid self-lubricating bushings, an engineering plastics with engineering plastics for the collar base makings, joining the reinforcing fiber and solid uniform synthetic grease, wear-resisting effect, and increasing the whole strength of the fiber can improve the bearing and edge under the pressure of ability, and realizing the high pressure resistance, high heat dissipation and creep force, at the same time, it had a good friction performance. Tests results showed that the average failure-free time of the new knotter was raised to 115000 bales, which greatly exceeded national standards and design requirements. It was proved by practice that the application of TRIZ can greatly accelerate the process of invention and creation and obtain high-quality innovative products.