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We report a theoretical study of pumped spin currents in a silicene-based pump device,where two time-dependent staggered potentials are introduced through the perpendicular electric fields and a magnetic insulator is considered in between the two pumping potentials to magnetize the Dirac electrons.It is shown that giant spin currents can be generated in the pump device because the pumping can be optimal for each transport mode,the pumping current is quantized.By controlling the relevant parameters of the device,both pure spin currents and fully spin-polarized currents can be obtained.Our results may shed a new light on the generation of pumped spin currents in Dirac-electron systems.