This paper proposed a decentralized coordinated control scheme for multi-motor composite web-winding system with two unwinding rollers. Firstly, the mathematical model of the multi-motor composite web-winding system is given. Secondly, the model of the subsystems are transformed into variation models at the set working point by setting error variables, and the reference control input and reference speed calculation expressions of the subsystems are given. Thirdly, interval matrix method is introduced to handle with parameters time-varying and uncertainty in the system. Next, a decentralized coordinated controllers based on state feedback are designed for each subsystem, which takes the current subsystem states and the states of adjacent subsystems into account. Furthermore, the sufficient condition of asymptotic stabilization of the closed-system is given based on the Lyapunov stability theory and gains of the controller can be obtained by solving Linear Matrix Inequalities(LMIs). Finally, some simulations are presented to illustrate the effectiveness of the proposed method for the four-motor composite web-winding system.