The invention discloses an electronic synchronous sequential control system used in a femto-second laser amplifying device, comprising a square signal generator for generating total clock control signals, a photodetector for receiving mode locking signals of seed laser, four delayers which are respectively a first delayer, a second delayer, a third delayer and a fourth delayer for generating signals with different sequences, a frequency multiplier for generating signals with higher frequency, and two pokerr cell synchronous drivers which are respectively a first pokerr cell synchronous driver for controlling one pokerr cell to perform laser pulse menu selection and emptying and a second pokerr cell synchronous driver for controlling the other pokerr cell to perform laser pulse menu selection. Being suitable for the laser amplifying device related to the prior art, the invention is also mainly suitable for use under the conditions with different pulse repetition frequencies of a laser used by pumping sources with various amplifier stages in the amplifying device, thereby having wider range of application.