Startup on-off controller for single-board computer system

The utility model relates to parts for single-board computer operating systems, in particular to a startup on-off controller for a single-board computer system. The startup on-off controller comprises a monostable trigger and an AND gate; the monostable trigger comprises a 74HCT123A chip; the AND gate comprises a 74HCT2G08 chip; high and low pulse trigger signals are given through excitation, and high and low pulse signals are output; the output end outputs two low pulses at a constant interval in a certain time through the AND gate; and on and off of the single-board computer system is achieved. By the use of the startup on-off controller, the problem that power-up of other modules and startup of the single-board computer system conflict with each other is well solved. The startup on-off controller has the advantages that timeliness is good, and on-off stability is high; the design concept is novel, and on-off response speed is high; a circuit structure is simple, no excess control resources are used, and implementing by complete simulation is achieved; the controller is simple to debug and more flexible to use.