The invention relates to the technical field of shield systems, in particular to a calculating method for pipe sheet ring numbers used for a shield machine. Through the assembly process of pipe sheetsof the shield machine and the prerequisite for assembly of pipe sheets, pipe sheet ring numbers for the shield machine are calculated. Concretely speaking, a push mode starting button and an assemblymode starting button on an operation panel of the shield machine and a stroke sensor on a push oil cylinder are connected with a control module such that the control module can access whether a pushmode is started, whether an assembly mode is started and stroke information of the push oil cylinder. According to the working process of the shield machine, a judgment is made as to whether an assembly machine finishes assembly of one pipe ring or not. Therefore, a control module records pipe sheet ring numbers such that information on the pipe sheet ring numbers is more reliable. Meantime, finally recorded errors of pipe sheet ring numbers caused by mal-operation of operation staff are avoided.