A small simulative seawater self-power-generation circulation system for juvenile popular science teaching and an application thereof are provided. The system comprises a waterwheel bracket, a waterwheel spindle, a waterwheel rotating wheel, a generator, a rotary bucket No.1, a rotary bucket No.2, a rotary bucket No.3, a rotary bucket No.4, a rotary bucket No.5, a dike base, a reservoir No.1, a reservoir No.2, a reservoir No.3, a reservoir No.4, a water release gate, a reservoir No.5, a combat readiness electrical appliance, a marine signal lamp system, a living electrical device, a battery pack, a suspended ring chain, a left slide rail, a ring chain lever hoist, a right slide rail, and a slope tidal water storage cofferdam. The small simulative seawater self-power-generation circulation system of the invention not only can be used as a reference model of a demonstrative project in which reef defending troops drive the generator to rotate and generate electricity through the power of tidal water and transmit the electricity to reefs through cables so as to enable the electricity to be used in living equipment and combat readiness instruments, but also can be used as a demonstrative teaching system for juvenile popular science education, and has huge practical values in popular science teaching and market application values.