The invention relates to a process for sewage treatment through an inserting sheet type precious metal iron-carbon filler sewage reactor, and discloses a sewage treatment process. According to the present invention, organic wastewater is pre-treated, the pre-treated organic wastewater and air enter a tank, and contact an inserting sheet type precious metal filler, the filler uniformly releases submetallic ions, and a microelectrolysis reaction is started; the inserting sheet type precious metal filler is formed by connecting a plurality of specially made steel plate monomers through inserting grooves in an inserting manner, and 0.1-2 g of palladium, 0.1-4 g of ruthenium, 0.1-2 g of niobium, 0.3-7 g of sliver, 0.1-3 g of platinum, and 0.1-2 g of lawrencium are fused into 10000 g of carbon steel and casting is performed to obtain the specially made steel plate monomer; and the sewage treatment process has characteristics of simple steps, easy control, and true achievement of no passivation, no clogging and no replacement, only maintenance is performed 1-3 times every year, each maintenance time is about 4 h, the COD removal rate is high, and no secondary pollution is generated to the water.