The invention discloses a method for achieving precise centring by means of simultaneous movement of multiple chain plate conveyors. A scanner is mounted above the chain plate conveyor at an edge folding station, paper roll data are read by scanning paper roll bar code information and transmitted to the chain plate conveyors, and the paper roll data of a paper roll are provided; and the pulse number, converted into an encoder value, of the paper roll is calculated through paper roll bar code width information. An encoder is mounted at the tail of a motor of the corresponding chain plate conveyor, the motor runs to drive the encoder to run, and the rotating value pulse number of the encoder can be directly read. A frequency converter is mounted in an electrical control cabinet and is used for adjusting chain plate speed values and synchronously adjusting the accelerated speed and the decelerated speed. A system PLC receives the feedback pulse number in real time, the running and speed of the motor are controlled and driven through the frequency converter, and precise centring is achieved.