The invention discloses a deep 
treatment system and a process for paper-making 
wastewater. In the deep 
treatment system for paper-making 
wastewater, a bactericide dosing device is adopted to pump a bactericide to a 
raw water pump and a sucking hole in front of a return water pump which is connected with a return 
water pool respectively, the added bactericide can be uniformly mixed under the stirring action of the water pump, and the problem that use effect of the bactericide can be degraded when the bactericide is used in a 
pool is solved; in addition, the weak oxidation environment-friendly bactericide used in the deep 
treatment system and the process has the rapid degradation characteristic, is free of residue after being used, does not affect the application after the 
wastewater is treated and is free of 
drug resistance, and even if the bactericide is used for a long time, the content of microorganisms in 
white water is not greatly increased under the condition that the use amount of the bactericide is not changed. The deep treatment 
system disclosed by the invention is very high in treatment efficiency, that is, the designed capacity is 3000m<3> / d, and has the remarkable characteristics that the wastewater can be recycled in a quality-divided manner according to demands of 
water use sites, and the comprehensive wastewater recycling rate can be greater than 90%.