TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred System: The system further comprises a waste solution storage tank which is connected to the UF treatment bath, and stores and provides the separated silicon waste solution to the line mixer; a first production bath connected to the UF treatment bath to store the isolated UF treated water; and a hot water feed tank connected to the first production bath to feed hot water to the UF treated water; and an alkaline material tank connected to the line mixer to store and feed the alkaline material to the line mixer. The alkaline material tank is electrically connected to a dehumidifier to control humidity of the stored alkaline material at a predetermined level. The system also comprises a hydrogen gas collector connected to the hydrogen production bath to trap and store hydrogen generated in the hydrogen production bath; an acidity adjuster connected to the hydrogen production bath, where an acidic material is stored and fed into the hydrogen production bath to neutralize alkaline water generated in the course of producing hydrogen gas; a second production bath connected to the hydrogen production bath to store a supernatant generated by neutralization; and a centrifuge connected to the hydrogen production bath to receive a precipitate generated by neutralization, dehydrate the same, and discharge the dehydrated material to the outside. The centrifuge is connected both the UF treatment bath and the second production bath, where the concentrated silicon waste solution fed from the UF treatment bath and the precipitate settled in the second production bath are received, subjected to dehydration, and discharged to the outside. Preferred Method: Production of hydrogen energy utilizing silicon wastewater further comprises discarding solids obtained by dehydration of the precipitate. Preferred Components: The alkaline material is at least one selected from sodium hydroxide (NaOH), potassium hydroxide (KOH), magnesium hydroxide (MgOH), calcium hydroxide (CaOH2), iron hydroxide (FeOH2), ammonium hydroxide (NH4OH), sodium carbonate (Na2CO3), sodium borohydride (NaBH4) and its mixtures. The acidic material is at least one selected from HCl, nitric acid (HNO3) and its mixture. Preferred Parameters: The alkaline water has a pH range of 12 to 13. Neutralization is performed to adjust the pH of the alkaline solution to 7 to 10.